Only block lists rather than allow lists are supported on most projects. Someone would need to fork Mastodon or other to switch to allow lists. This would be a

Only block lists rather than allow lists are supported on most projects. Someone would need to fork Mastodon or other to switch to allow lists. This would be a bad departure but will surely happen in some cases. They could even disable the account move feature to lock people in. Maybe truth.social did that and is why it is basically a closed off island.