I don't think that's true, people bitch about those services all the time. Everyone that uses FB has a gripe about it. Windows users have been complaining about Windows non-stop for thirty years.

I'm not arguing that people will switch off of those to crappy self-hosted replacements out of sheer spite against megacorps, I'm arguing that they will switch when self-hosted replacements are better and easier to use. Building a self-hosted platform that does what Facebook does more easily and conveniently than Facebook is hard, but IMHO it's easier than building AWS or Salesforce, and it gets easier every year, due to bandwidth and cloud hardware getting cheaper and big tech getting more user-hostile.