When you post on reddit, instagram etc. you're giving the company your valuable data. (And it often is valuable, you put your thoughts into it and all that). Consider if you take 15 minutes to create value content, you'd get paid $5 or sth if you were doing it commercially. Now all that value is donated to big tech companies. (that's the only reason why they have value at all.)
So what's the problem with that? The problem is that reddit and others can instantaneously put your years-long effort behind a paywall. I'm not joking. Look at these:
when i want to see content on reddit (for research) or instagram (for local community) they don't allow me to see the data that users have contributed. Reddit claims that it blocks VPNs for "security reasons", meanwhile i'm using VPNs in browser's incognito mode to not be tracked. Instagram wants you to sign in sothat they amass more users and can take leverage of the network effect even more.
I can understand restricting who can post to limit bot activity, but reading must always be possible. After all, it's our data. That's exactly what happens when you give your data to big companies to "communicate with other people": your data becomes a source of income for them, at our expense.
I think that's an overly reductive analogy. Of course the backend web server knows what it processed on its own hardware, but it doesn't need to know the IP that the request originated from (if using a VPN) and it certainly doesn't need to fingerprint the browser with hidden scripts.
Likewise, the browser probably doesn't even need to make that information available to those scripts. There are extensions to block some of it, but apparently not all. And blocking some things can break some websites.
But there's no reason the chef in the back should be running a forensic analysis on the fingerprints on the ticket, the footprints on the dining room floor, or the crumbs swept up at the end of the day. And if you suspect that they will do this, then it should take be overly complicated to wear gloves, and maybe some boot covers, and possibly a full hazmat suit if you're really worried about dropping crumbs and dander.
Not that all that should be necessary, because it shouldn't be standard practice for web servers to collect all this data to begin with...