Earlier quoted context omitted.
Ah yes, my Monero nails. https://en.wikipedia.org/wiki/Monero Observers cannot decipher addresses trading Monero, transaction amounts, address balances, or transaction histories, but im sure my old 14th century hammer will address this issue somehow even though subaddresses can be created that arent even remotely linked to my main address. https://monerodocs.org/public-address/standard-address/
You just ban Monero then. If something is a problem, and you want to ensure financial visibility then ban all transaction types that hide visiblity, like banning mixers. This is separate from whether it's a good idea or not.
You cannot ask ransoms in a currency the victim cannot access.