I'm a bit late but: strongly against pre-emptive blocking

defederation should be a poweful & last-resort moderation tool (since it's taking agency away from users). obviously it is justified in some cases (gab, truthsocial etc), but we're nowhere near the point at which blocking meta seems justifiable.

the data-harvesting justification just seems confused (meta care about building profiles of people they can show adverts to, they dgaf about people on other fedi instances)