ok, let me clarify. Obscenity is not protected under the first amendment. Accidental gore/maiming is allowed(grey area), however once it hits the obscenity level the supreme court has declared that it is a violation of federal law and therefore illegal. It’s a huge reason that many sites actively take the content down and have it against TOS. Most enforcement/regulation with the standing is generally in relation to minors, but it isn’t exclusive to minors.