The issue is that users might object to subscribing to a community on a particular instance. I guess it’s not the end of the world, you can always unsubscribe but I can imagine some people being very upset to be associated with certain politically leaning instances or worse.

I think it should be a “copy community” feature, then mods can just prevent posts in the old community and make a sticky that points to the new location.

Making users automatically subscribe to a community on a different instance (even if it’s “the same community”) is pushing it a bit in terms of moderator power. Also makes things worse in terms of exploits and others have pointed out.

Let’s not forget the EULA difference. GitHub will own your code to a greater degree than the alternatives, in order to feed their AI. I don’t think you can opt out?

That’s how I know I chose the right instance!