The people will just recreate the same community on the same platform without you as the owner. They don’t care about you running it.

It’s also a futile effort since age checks for adult content is becoming the law around the world so soon any platform you move to will have the same checks.

In most cases, I would like to speak with those people and would miss them if I lost regular contact because they didn't want to change platforms.

Most people just care about being able to talk to each other, not their devotion to some "group or society".

I disagree with this sentiment. It is entirely possible that there will be people who are regulars on one platform who are just unable (actually unable or perceives themselves unable) to migrate and the morale lost from losing their regulars is huge. Or a subset who insist on staying, forming their own sub-community, and neither the migrating group nor the people who insist on staying produce enough engagement for the members and so the community as a whole fizzles out. This is all squishiness. There is a reason why deplatforming appears to work in reducing the effectiveness of political groups, even if the people who remain in the community post-deplatforming are hardened in their loyalty to the political policy of the group.

>You're filtering out people who don't really care about participation in whatever group or society is there.

You underestimate how many people would rather do nothing than be inconvenienced, sadly. If you're not the personality that the community is rotating around, you'll find the migration pretty lonely.

Heck, even esablished personalities can only do so much. Remember that Microsoft paid top Twitch streamers 10s of milllions to move to Mixer for exclusive streaming. Even that wasn't enough to give a leg up.