memes

I don't know if it will last as the fediverse scales, though...

"No ads" might last, with a little effort. Larger instances might start including ads in order to pay for the substantial server resources needed to run them, but you could always just use a smaller instance without ads -- or even run your own, private instance without ads -- and posts from the other ad-supported instances would still federate to you and vice versa, allowing you to participate without ads.

No 'content creators' trying to grab your attention for money, though... That can never last. The more popular the service gets, the more such people will come to it, looking to take advantage of the wider audience available here. And, honestly, the fediverse might be even weaker against that. While some instances might make rules against it, they'll go to instances that don't have rules against it, or poorly moderated instances, or they'll make their own new ones. You can always block them, sure, but new ones will pop up faster than you can block them if it gets popular enough. At least as long as Capitalism lasts, whenever there's a large group of people, others will come to try to sell things to those people or extract money from them in other ways.