There's no reason social media couldn't work this way. You should be able to leave Facebook or Twitter for Mastodon, Bluesky, or any other service and still talk with the people you left behind, provided they still want to talk with you:
https://www.eff.org/interoperablefacebook
That's how the Fediverse - which Mastodon is part of - works already. You can switch from one Mastodon server to another, and all the people you follow and who follow you will just move over to that new server.
12/