One irony of nostr:npub1lh273a4wpkup00stw8dzqjvvrqrfdrv2v3v4t8pynuezlfe5vjnsnaa9nk's CASF (CSAM activated soft fork) is that users would have to go and see that there's ndeed CSAM in an OP_RETURN, which AFAIK would actually be illegal. (I know I certainly won't do it.)