Sorry, I'm thinking strictly in terms of Reddit vs. Lemmy/Piefed/adjacent networks because they are essentially Reddit alternatives that function the same. I don't really know much about Mastodon or other alternative networks, nor can I speak on their health - but the lemmyverse (including new piefed instances) seem to be fine overall.
This is a strawman: I'm saying "We should not have to rely on open registration instances and hope that the admins get enough funds to keep going", which is not the same as "all instances should be paywalled".
If Piefed (or Lemmy) brings in effective community migration where an entire community can be lifted from one instance to another, then I am not bothered by future lemm.ee scenarios happening. Communities can become nomadic, and that's fine.
Again, it's not just about reddit. Also, it's about having places where politics are not such a proeminent part of the discussion. E.g, Threads got a lot of their initial momentum by avoiding politics and getting sports journalists to post about NBA and football.
That's on people needing to do that. You don't need to convince me of that. I'm doing it with music and TV. People have to be the change they want to see. But there's not really anything anyone can do about that with regards to how the audience here interact, or how much interest they have in things outside of politics.