I think the average person just simply doesn't care about their privacy.
In some of the music communities I'm in the content creators are already telling their userbase to go follow them on threads. They're all talking about some kind of beef between Elon and Mark and the possibility of a boxing match... Mark was right to call the people he's leaching off of fucking idiots.
Ultimately, even for me as someone who cares about it, it's just become one of those things that I don't prioritize. Life is hard and at some point I'd rather get something cool done with gmail reading all my private conversations than struggle with my own email server.
Not saying it's a great choice but ultimately life is short and we need to focus on doing what feels right. People have to pick their battles and that's life.