although this is unlikely to substantially and directly impact us and is a more immediate concern for Mastodon and similar fediverse software, we've signed the Anti-Meta Fedi Pact as a matter of principle. that pact pledges the following:
i am an instance admin/mod on the fediverse. by signing this pact, i hereby agree to block any instances owned by meta should they pop up on the fediverse. project92 is a real and serious threat to the health and longevity of fedi and must be fought back against at every possible opportunity
the maintainer of the site is currently a little busy and seems to manually add signatures so we may not appear on there for several days but here's a quick receipt that we did indeed sign it.
This has to do with Project92, not just with Facebook hosting Mastodon instances. I wouldn't put it past them to discretely host instances to gather data, but we can't see them, and therefore we can't defend against them (and mass-defederation of potential instances is a recipe for disaster).