Earlier quoted context omitted.
Centralised platforms have utterly failed us though, and have become a way to manage information centrally - someone decides what you can or can't see/read/know about. Decentralised is really the only option for an informed humanity. In the long run, this has to be the answer.
Even in the best case scenario where everyone starts using different instances of Peertube, won't it end like 2012 Reddit full of racist and paedophile instances? You need a minimum amount of moderation to remove the least desirable groups of people from posting content.
There is only one Reddit instance. Subreddits may have quasi-independent moderation (Reddit admins can always intervene if not doing so would cause bigger PR problems than they're willing to ignore or deal with in other ways) but there's no real way for one subreddit to disassociate with other subreddits.
PeerTube (or Mastodon or PixelFed or Lemmy) instances can disassociate from other instances that have incompatible moderation practices, though. Either through allowlisting or denylisting depending on the operators' risk models.
Using Mastodon as a case study: Gab tried to pivot to ActivityPub-based software (I think Mastodon) and yet they were denied the ability to federate with most instances because it's a deeply toxic community.