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.
Haven’t tried it, but I think it’s definitely a novelty. It’s way smaller than my Miyoo Mini and my hands get cramped trying to play games on it for 15+ minute sessions.