The problem isn’t about ToS or other kinds of rules, it’s about what drives them.

When I join a community, I would like to be able to predict whether tomorrow, they might ban Chinese projects, or projects written in Lisp, or projects that only run on Windows.

This doesn’t follow from the ToS, it follows from what the platform’s values are. Codeberg does publicly state its claimed values, but they don’t imply these new bans.