As I said, I fundamentally disagree. Even if you can make a nearly-teenager-proof website (and so far, your example has been something that most of the people I was at school with could have beaten aged thirteen), teenagers can just go to a different website, so the system is only ever as teenager-resistant as it is difficult to find a website that doesn't care. Most vaguely competent teenagers know how to find pirate sites with illegally-hosted TV, movies and music (even if they're not techy, one of their friends just has to tell them a URL and they can visit it). Governments have had minimal success stopping online piracy even when aided by multi-billion-dollar copyright-holding companies, so there's no realistic reason to think they'll have any more success stopping porn sites with non-compliant age checks.
AnyOldName3
My point is that you can't build a completely teenager-proof system. Even if most parents uphold the most unimpeachable password discipline, someone's going to put a password on a post-it note near their computer, and have their child see the piece of paper, or use their dog's name despite their child having also met the family dog.
The original comment I was replying to was framing the issue as teenagers being allowed to watch porn versus no teenager ever seeing porn and maybe some freedom is sacrificed to do that, which doesn't match the real-world debate. If freedoms are sacrificed just to make it a hassle for teenagers to see porn, that's much less compelling whether or not you see it as a worthwhile goal.
As for what a teenager with access to their parents' bank password would do, if they're not a moron, they'll realise that spending their parents' money will leave lots of evidence (e.g. that they have extra stuff, their parents have less money than expected in their account, and there's an unexpected purchase from The Lego Group on the bank statement), and so they're guaranteed to end up in trouble for it. It's not any different to a child taking banknotes from their parent's wallet. On the other hand, using it to prove adulthood, if it was truly untraceable like adults would want, wouldn't leave a paper trail.
- Teenagers can find out their parents' passwords (or their friends' parents' passwords) if they really want to, and if things are anonymous enough not to leave a paper trail that would allow spouses to see each other's porn usage, they're anonymous enough to let teenagers hide that they're using their parents' credentials. 2FA helps, but it's not like teenagers never see their parents' phones.
- There's not anything that all adults in the UK have that could be used for everyone. There's no unified national ID or online government identity. There's no one-size-fits-all bank login system. You'd have to build and secure tens of independent systems to cover nearly all adults.
- As I said in the post above, if it's too much hassle for teenagers to access mainstream, legitimate porn sites, then there's very little anyone can do to stop them accessing obscure ones that don't care about obeying the law or can't do so competently. If governments could stop websites from existing and providing content, there wouldn't be any online piracy.
They consulted with MindGeek, who own Pornhub etc.. They're one of the few companies big enough to comply. It was designed to preserve their monopoly, not Meta's. The politicians voting on it didn't necessarily understand that, but the law had been approved by children's charities and (a single representative of) the industry, so there'd be no reason (if you didn't understand how technology works) to question it.
There is no possible way to actually stop teenagers accessing online porn that doesn't require such a massive invasion of privacy that it leaves no safe way for adults to access it. To go with your adult video store analogy, it's like if the store staff would have to accompany you home and watch you watching the porn to check there wasn't anyone standing behind you also looking at the screen, and while they were there, they were supposed to take notes on everything they saw. Even if they had no interest in doing anything nefarious, a criminal could steal their notebook and blackmail all their customers with the details it contained, and there'd be enough proof that there wouldn't be any way to plausibly claim the blackmailer had just made everything up.
If you want to prove someone on the Internet is a real adult and not a determined teenager, you need lots of layers. E.g. if you just ask for a photo of an ID card, that can be defeated by a photo of someone else's ID card, and a video of a face can be defeated by a video game character (potentially even one made to resemble the person whose ID has been copied). You need to prove there's an ID card that belongs to a real person and that it's that person who is using it, and that's both easier to fake than going to a store with a fake ID (if you look young, they'll be suspicious of your ID) or Mission Impossible mask, and unlike in a store, the customer can't see that you're not making a copy of the ID card for later blackmail or targeted advertisements. No one would go back to a porn shop that asked for a home address and a bank statement to prove it.
Another big factor is that if there's a physical shop supplying porn to children, the police will notice and stop it, but online, it's really easy to make a website and fly under the radar. It's pretty easy for sites that don't care about the law to provide an indefinite supply of porn to children, and once that's happening, there's no reason to think that it's only going to be legal porn just being supplied to the wrong people.
Overall, the risk of showing porn to children doesn't go down very much, but the risk of showing blackmailable data to criminals and showing particularly extreme and illegal porn to children goes up by a lot. Protecting children from extreme material, e.g. videos of real necrophilia and rape, which are widely accepted to be seriously harmful, should be a higher priority than protecting a larger number from less extreme material that the evidence says is less harmful, if at all. Even if it's taken as fact that any exposure to porn is always harmful to minors, the policies that are possible to implement in the real world can't prevent it, just add either extra hassle or opportunities for even worse things to happen. There hasn't been any proposal by any government with a chance of doing more good than harm.
A cheap record player or a cheap CD player were always better than a high-end cassette player. Cassettes were designed to be small at the expense of quality at a time when technology didn't allow things to be both small and high quality, and the constraints of the medium are well within the bounds of what most people can easily hear. Once CDs and their players became cheap, tape was entirely obsolete, and didn't have the I don't understand Nyquist Sampling Theorem or acknowledge the existence of dust excuse that vinyl had.
Some homophobes think touching their own genitals would be homosexual, so they don't wash them.
Windows permissions are more flexible than basic Unix ones. A file doesn't just have an owner and a group, it can have individual permissions for arbitrarily many entities, so taking ownership doesn't remove any of the permissions from anything that already had access, it just adds more. The command shown here is closest in effect to deciding you're always going to log in as root from now on, although Windows has a way to effectively do that without modifying the ACL of every file. Either way, it's silly, and usually people who suggest it are under the impression that XP did permissions right by not meaningfully enforcing them and not having an equivalent of a root account you can temporarily switch to, and Vista only changed things specifically to annoy people, and not to be more like Unix.