So Germany made a law that anyone can choose their sex (in a legal sense) and get documents to state they're actually the opposite sex. No gatekeeping, just self ID.
Almost immediately, a bunch of men (including rapists, murderers, paedophiles and piss takers) decide they're women and get the documents to state that they're women.
Politicians and activists who campaigned for this are surprised and shocked that this has happened.
Nobody on mumsnet is surprised by this because it was fucking obvious it was going to happen.
(IIRC it was the same in Ireland. There was a bizarre quote by a politician or lawyer along the lines of "We didn't realise that when the self-ID law was passed that people would just self ID".)