The best thing here, I think, would be to create an informational pamphlet kids could print out and give to their parents, showing examples of dick pics and swearing in literally every game imaginable, with the message of "this is just what 12-year-olds do to other 12-year-olds when given microphones and the ability to upload pictures; there is no way to stop this. Even if you ban them from games altogether, other 12-year-olds are just going to swear and draw graffiti dicks in places your child can see at school. Just give up already."