Beehaw defederated from a lot of other major instances.

Something like what I wrote in my other comment: https://lemmy.world/comment/6698854

Two businesses can trademark the same name if they are operating in different industries. Or, the name could have spaces or punctuation that renders the same as a TLD.

Go Ogle Photographic & Paparazzi Inc. could have a reasonable claim to the same .google TLD. The registration fee is chump change for Google/Alphabet to make sure this can’t happen.

I’m sure Google didn’t buy those for the purpose of actually using them, but rather to prevent someone else from registering and using them.

Yes

Same as the others - nothing.

Twitter clone by Facebook. The worst part is they’re implementing ActivityPub and will federate with Lemmy and Mastodon instances.

Threads is not a Lemmy instance, but it is implementing the ActivityPub protocol and thus will be able to federate with Lemmy instances, Mastodon servers, presumably kbin, Friendica, GNU Social, etc.