Maybe connecting it with the threads of mastodon is a stretch, and I am not talking "Idea wise" who they're copying I'm talking about the literal code of the meta app, it's a goldmine for them a prebuilt app with most of the features you need and with a protocol that is having some kind of active community? Now maybe they didn't literally fork mastodon, but the fact that the app seems clearly not finished, It's like put together in the few weeks a lot of code was probably used or referenced. Now I can't confirm or deny this, just saying that if they wanted to take the easy route, they definitely could have and from the record of such large corporations I can definitely see them do this.