But that’s the risk taken when you create a protocol (ActivityPub) that anyone can tap into. You can’t create something that is open to everyone and then pitch a fit when entity you don’t like or agree decides to take advantage of it. Regardless of how big Threads get, it can’t supecede the ActivityPub protocol. If they decided to defederate down the road in attempts to extinguish the Fediverse, it won’t work, those users will still remain and Threads will go on it’s merry way. Meta can’t kill a W3C protocol.
Stopped using Reddit as soon as it was clear that they were destroying 3rd party apps. Occasionally a search result brings me there, but I try to avoid the site all together where possible.