They only have to keep migrating because every time they join a new instance they either don’t agree with the admin’s approach to blocking content or they do but those admins tolerate intolerable content.

Presumably they’re leaving Reddit for a similar reason and will continue to have the exact same issue across any social media platforms until they find a way to resolve that issue. Either by accepting that seeking a highly permissive blocking policy will put them in the company of scumbags, or reassess whether they’re right about how relaxed they want the moderation of the spaces they inhabit to be.

Personally my take away in those circumstances would be, “hmm, seems like only scumbags share these beliefs with me. I’d better look much more carefully at those beliefs…” but we all need to choose our own paths…