A lot of people dislike it for the privacy nightmare that it is and feel the threat of an EEE attack. This will also probably not be the last time that a big corporation will insert itself in the Fediverse.
However, people also say that it will help get ActivityPub and the Fediverse go more mainstream and say that corporations don’t have that much influence on the Fediverse since people are in control of their own servers.
What a lot of posts have in common is that they want some kind of action to be taken, whether it’d be mass defederating from Threads, or accept them in some way that does not harm the Fediverse as much.
What actions can we take to deal with Threads?
I don’t think you need to read too much into it.
If Meta concludes that federated platforms or activitypub may one day start to eat their lunch, then the clear and obvious first step to any strategy is to have some sort of presence in the fediverse.
Honestly that’s as far as you need to go for the moment. Grab some market share and then avail yourself of opportunities as they arise.
Perhaps it will be EEE, perhaps something else.