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Are you familiar with the fediverse ? You can interact with people and communities on different instance the same way as you can sent an e-mail from hotmail to gmail.
Instances are managed by individual and non profit. Just-like big social media, they can decide to turn-off an instance (remember google plus ? ) for whatever reason, and your MPs are on that person server (again the same as big social-media, that's even their business model). A coll thing is that if you have 5 shady person and 95 honest person it's still better than a big social media which is 5% dishonest with everybody (and I'm sure you've heard enough about threads and tik-tok being spyware to know that big-social media are more than just 5% dishonest), but use common sense regarding cyber-security (don't use Lemmy's MP for sensitive informations)
Even though the project has been existing for a few years, we're all pretty new here, so we don't know much more than you.
That's pretty interesting, thanks.