Regarding Meta: Yes.

Step 1: Simply join the fediverse. (Embrace)

Step 2: Make suggestion on how to improve the ActivityPub protocol (e.g. for Ads) (Extend)

Step 3: "Oh, sorry, we'll defederate, say hello to our new platform! Thanks for 10 Million users!(Extinguish)

We probably should start blocking them at a network level right now so they can't scrape any content: https://codeberg.org/cuchazinteractive/iptables-asn-block

I simply hope that nobody will federate with them. Then they can enjoy their walled garden.