That's about what I do. I get that most people don't have the time and expertise to do it, but I self-host Nextcloud and Matrix chat. Most of my private data isn't on other people's platforms anyways. And I'd pay the small sum for a decent e-mail provider. And apart from that I don't really mind. Whatever I post on social media is there for the public. I don't mind if someone uses it to train AI. The bugreports and code I post on Github is licensed to be used freely. I don't care how it's used, I think using it as training material is kinda alright, since AI (or humans) don't reproduce more than a few lines.