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.
One could argue the design choices themselves are hardcoded opinions, as it would be possible to imagine for example a more democratic way to moderate.