Thank you for pointing out that this is so much worse than just EEE. Meta has a long history of social and political engineering, and deliberately creating a toxic environment that turned all of our parents and grandparents into deranged conspiracy theorists. They don't just let hate thrive on their platform, they artificially inflate it in the name of engagement and profit.
I see no reason to assume they won't do all of this again, and should they do it all again it's going to impact the entire Fediverse. Even if you just stick to instances that block Meta, if you're federating with instances that aren't, the toxic environment Meta is likely to build will come back to you. If the majority of instances fail to block them, I can't bear to stay here and watch what has become the internet's most healthy and vibrant community rot from the inside.
I honestly don't understand why this is even a debate. If even a fraction of the shit meta has pulled was done by a smaller Fediverse instance, we all wouldn't hesitate to defederate from them.
And to those of you who justify Threads because Meta is somehow the lesser of two evils compared to Twitter, please remember that while Twitter is owned by a raging and incompetent manchild, Meta has eroded democracies and played a major role in a genocide. Don't fucking support these murderers. Meta is more than happy to spread even more hatred and killing in the world if it boosts their profits.
Too bad this instance won't approach federation with Threads in the same manner; I don't think any positive outcomes could be expected from their behavior either.