@nclslbrn I don't think it's that irrational at all, the scale of these platforms and the number of people _potentially_ interested in your creative outlets is incomparable, and I'd think is the main consideration for staying there. But I too think the word "potentially" does _a lot_ of heavy lifting here...
I'm not talking about yourself here, but I think people could at least show a little more self-interest and at least start trying to own more control over the fruits of their own labor and their own audiences, rather than relying purely on these platforms, the power dynamics they enforce and the behaviors they create... I don't just mean fediverse here, but also own websites/blogs/newsletters etc.
It's truly messed how the number of one's social followers (on these commercial platforms) has become this status symbol for personal worth and a filter to be even considered for various opportunities. Everything just becomes about marketing. Opt out from Twitter/IG and you have to find alternative avenues because various people/orgs will show no longer interest. Likewise, stay on there and you have to fully embrace the platform to stay visible/relevant: Post daily/regularly, but not too often, not too many posts in one go, don't edit too soon after posting or your post will be suppressed, post something slighty off-topic from your usual content which causes maybe less "engagement" and for a while your future posts will be seen by fewer people, write a long thread and only some messages from halfway in will be amplified (out of context)... I don't know how people manage to stay sane with all these (undocumented) ever changing "rules". It's like stochastic terrorism, leading to some very weird/sh*t behaviors on the receiving end... Every aspect and micro-decision is measured, second-guessed, optimized, maybe not consciously...