The Wikimedia Foundation has joined the fediverse by setting up their own Mastodon server!

Best analogue I've heard is to think of it like email. Google can run Gmail, Microsoft can run Hotmail, and countless others can run their own email setups and everyone talks to each other just fine.

The fediverse is the same. Lemmy is made from a bunch of randos running their own Lemmy servers, but we all interact like it's one big Reddit-clone.