I don’t think anyone can argue that some content should never be shown in a public app accessible by anyone and that it shouldn’t be up to the user to opt out. It just shouldn’t show in the first place. Pretty much every nation on earth (probably) has laws for that.
I think it’ll be possible to block the content but not the user, but have to remember at the end of the day the relay is responsible for content hosting and they will be held accountable to law. It’s up to the relay operator if they want to serve jail time or not..