To be clear, not talking about this community, obviously 😛.
What's the point of writing down rules, if mods just do what they want? But I suppose that's the risk you take when you call someone a liar in a small community; they might be a mod.
Edit: I'm not trying to say that mods suck, they perform a useful and often thankless job. Just that it can be difficult for small communities to get a healthy number of good mods, which can become a problem.
Bans not notifying the user is a Lemmy-wide problem.
Lemmygrad is pretty explicit in its instance rules IMHO about what it doesn’t allow. I don’t think it’s exactly a secret.