Code for people interested
app/admin/routes.py#L373 (removed since posting), app/cli.py#L1026
I commented it out, rebuild the Docker containers and it works now 👍
EDIT: People seem to misunderstand what it does. It prevents it from federating automatically when populating the community search, importing from another instance or from Lemmyverse. It’s not a full block, and you can still add it manually. Not only that, but it’s also already partially removed since I posted this.
thanks for pointing to that issue. i dont know how piefed devs reacted to this. so i will give them the benefit of the doubt: it could very well be a quick and dirty solution, never meant to last long.
as the lemmy devs showed, it does not have to be like this at all. but i haven’t seen that much oppinionsted and defensive actions from the piefed devs.