defederation doesn’t do this. it was mean to; but it doesn’t work as it was intended.
doing so only excludes your community from the main group chat that everyone else can see, which empowers them over you in addition to creating those inactive/no-content subs for your community.
so nothing about this situation is working as designed.
and to answer your other glib comment: star trek matters to me so i don’t want to see this instance wither away from lack of content. that’s why i’m trying despite the toxic attempts to shoot the messenger.