"Illegal content of any type" is an incredibly thorny concept. Illegal where? Where the poster is? Where lemmy.world is hosted? Within some nebulous consensus of Western nations? Only the US states that matter, excluding Wyoming and Montana?
It's illegal to be gay in Saudi Arabia or Uganda. Is gay content not allowed? Switchblades are illegal in California but not in neighboring Oregon. Am I not allowed to talk about switchblades? It's illegal to export strong encryption technologies from the US. Am I not allowed to talk about encryption? Etc., etc., etc.