Maybe I'm bitter, and I know a lot of people wouldn't agree with this, but honestly? I think the non-corporate part of the Fediverse should just assume malice from the get go and preemptively defederate from whatever Meta put out. That way nothing's changed - Meta would essentially have a private / proprietary / isolated network, as far as users are concerned (much like Facebook already is), and even if the Fediverse will see less growth in the short term because of that, there will be no confusion on where everybody stands.
E: Well, thankfully and as expected, I'm not the only one to think this way: FediPact is an Organized Effort to Block Meta’s ActivityPub Platform
Look, I despise Google as much as anyone these days, and I'm glad they're taking a beating this time around, but at the same time, it's also kind of bullshit. And it's not even because you can sideload apps, or have alternate appstores on Android, but because we have yet to see the same standards being applied to Apple.