People don't leave platforms until their discomfort outweighes whatever they want from the platform. Things have been on the slow slide to enshittification for more than a decade now. AI is kind of raising the stakes a bit and increasing the rate at which things get endhittified, but you'll note that most people don't leave because of that. They find ways to circumvent it. We have seen this with Google Chrome, Firefox, DuckDuckGo etc.

People don't like change. They get comfortable with a platform and they stick around there until it's completely untenable. The easier it is to insulate yourself in that platform from things you don't want to see, the more likely people are to stick around. This is why so many people tried to block Elon Musk's account on Xitter, instead of leaving. It's why they block communities like r/thedonald on reddit. It's why Tumblr is currently having a whole shit fit about the exclusion of trans flags from their little icon fest thing for pride month, and doxing themselves/other ban evading accounts in the process.

When they do leave, they don't often try to get others to leave with them. They ghost the platform and move on. Sometimes that means going somewhere else. Sometimes it means filling that hole with a different kind of platform entirely.