Threads is a twitter competitor by meta. They plan to eventually federate with the wider fediverse and to that end have contacted some of the larger fediverse servers like Mastodon.social (not mstdn.social) to do this. People are defederating before this happens because they worry meta will negatively affect the fediverse.
No worries, I was just trying to clear up any confusion! Mostly because those two instances have a really similar name, and are easy to mix up.
I think there were a lot of rumors about stux, because he runs a couple big servers, & wouldn't sign that anit-meta pact, but I know he denies going to the nda meeting, & he announced blocking Meta today, after a big poll.
Good to know where to run if this becomes a bad thing. Mostly staying because migration isn't where I want it yet. Bit sad to see my posts and boosts go.