A growing number of instances (mainly of Mastodon so far) are signing an ‘Anti-Meta Fedi Pact’, pledging to block any instance owned by Meta in the fediverse.
I don’t know how big this will get or how effective it will be, but if you run a fediverse instance, you should take a look at this https://fedipact.online/
I avoid their services like the plague, but not everything Facebook does is inherently evil. For instance, they did zstd, React, and Ent (I’m not a dev, so I may be wrong about the last two being good, but React at least seems to be very popular). They’re also in the top 10 of employers contributing to the Linux kernel from 5.16 to 6.1.