I don’t trust Facebook at all. But firstly, what we’re building needs to be resilient to bad actors. Secondly, it’s not a zero sum game, something can be beneficial for Facebook and the fediverse. Thirdly, let’s be honest, no one that is currently on Mastodon is ever going to migrate to threads. And something like Threads is the only way most people would join the fediverse. You can hate Facebook and still think that Threads may be beneficial for the fediverse, they’re not mutually exclusive positions.
They already do this though, it’s called Facebook, Twitter, Instagram, etc. That’s why the EEE argument doesn’t make sense. The distinguishing features people keep talking about already exisit in a wall garden yet Mastodon has users. The features that Mastodon users want is freedom and control. Threads can’t compete with that but Threads can introduce millions of users to the concept of federation.