The Lemmy devs have expressed several times that they don’t want to interfere on how people use their software (e.g. admin the instances and mod the communities).
Which is good (and allow us to say that they can’t indeed interfere with Lemmy as a whole), but that also means that they won’t be the one “cracking down on bad actors”
gui.fediseer.com might be something along those lines, with a chain of trust between instances