It’ll be interesting to see what happens with this in the long run. I think the fediverse see’s Meta’s EEE play coming from a mile away compared to previous examples of big corps killing a standard. If Meta really does fork ActivityPub, I could see two webs of federation existing side by side. Enough of the fediverse is against Meta’s integration that Meta breaking the ActivityPub standard won’t force everyone to follow along. If enough instances stick to spec, then there’s still a fediverse to interact with on spec. Some will if they think the large user base Meta brings is worth it, but not all.