I'm actually curious about "Embrace Extend Extinguish": What can they do? They "extend" the ActivityPub protocol in a proprietary way, ok. Doesn't mean any other instance has to use that, no?
Ok, that would mean if an instance doesn't follow that extension, it can't interact optimally with Threads, but how does it matter? To me it seems all that can be lost by that is the content/user base that Threads brings into the Fediverse and then we are at the same point as we would be if we defederated immediately.
Maybe I'm missing something here?