The problem there though is that Discord doesn't just accept your say so that you're 18+ if you're in the UK, you have to verify your age with either a selfie, id, or through a third party, which is what I assume they're objecting to (I know I refuse to do that..)
u can fool the selfie verification. the AI that processes the verification doesnt recognize very realistic AI images as fake. just use a good AI image of some old dude.