The instance you are imagining will inevitably be inundated with the output of spambots. You don’t want a completely unmoderated instance because it will just not be an enjoyable place (even for you! even for people who have no problem with getting exposed to “hate speech”!) to hang out on.

I think lemm.ee defederates from very little, that is the closest I know of, but I see that that’s already where you are, so I can’t help you much more than that.