[0] pop up blockers, originally
If you live in the city, advertisers manipulate you every waking minute of your day, bombarding you from billboards, on tv, on the internet, and are constantly shoving their disgusting garbage in front of your eyes in new ways; at petrol pumps, on your tv menu, right in front of you on a taxi cab.
Worse still, the more you pay to avoid this trash, the more you become attractive to them as someone with money to spend. I can't remove the ads as a walk about the city, but for damn sure I'll remove them wherever I can in my home. Pi hole, ublock origin, sponsor block etc, all running to keep this crap out of my life. If people wont pay money for what creators are making, and they can't provide it for free, I'm fine with it going away. It probably wasn't worthwhile to begin with - only "addictive".
Ads are a scourge and make me sick. There are no "acceptable ads".
They can all pay the consequences now of me blocking them.
If they had been well-behaved and stuck to inline ads with no cookies, I would have left them there.
I REALLY do not want to pay for a bunch of random services with my tax dollars. In your example, once I lose interest in youtube (or peertube in this case) I would still be paying for other people to use it and I get no benefit.
Right now, when I lose interest in Facebook (as I did) I just move on to the next service, it is unbelievably friction free. I just type a few letters in a URL.
Facebook dislodged Myspace, Tiktok is competing with Facebook, Discord is a brand new social media product. Anyone is totally free to create a subscription service or alternative (see DuckDuckGo). I don't understand the monopoly case.