I'd assume any actions by Facebook are hostile and are attempts to Embrace, extend, and extinguish

The strategy's three phases are:

• Embrace: Development of software substantially compatible with a competing product, or implementing a public standard.
• Extend: Addition and promotion of features not supported by the competing product or part of the standard, creating interoperability problems for customers who try to use the "simple" standard.
• Extinguish: When extensions become a de facto standard because of their dominant market share, they marginalize competitors that do not or cannot support the new extensions.

It's just more embrace, extend, extinguish crap. Meta absolutely shouldn't be trusted, especially with their track record so far. Most (though not all) instances I know are defederating.

They are welcome to use the is core software. But they should be defederated immediately. We have seen this before. It’s never different.

I think federating with an instance that would actually want federation to die (have a monopoly) is a very bad idea. Meta would use it's leverage to actively undermine and harm the Fediverse, because it's not in their interest to distribute the userbase to multiple servers they don't own. They only need it to bootstrap their own service.

Ever heard the phrase "democracy without democrats"? That would be Meta in the Fediverse.

I hope any fediverse instance I use defederates with them.

Facebook/Meta and the like have proven to be untrustworthy. If they were a person, would you let them federate with your friend group? I wouldn't. I hope they're not invited to the party because the things that brought me here are the things that drove me away from there.

they should stay out.
usually if corporations try to get on things like this, they try to convert users to their platform then seriously limit or degrade the experience when interacting with anything outside of their stuff.

so in the end, everyone is trapped in their ecosystem.

I'd say wait and see how it plays out. I'm all for making the fediverse more accessible to the general public, as long as Facebook/Meta doesn't try anything funny, which does seem unlikely, but we shall see.