Privacy only works if it’s baked in, because everyone will never be on the same page or equally informed.

Money travel rule is old school regulation, but take email money transfers for example: banks have a recipient field that says “Phone Number (optional)”, so even if you’ve never provided this info to the bank, and even if its not a regulatory requirement for the transfer, your friend that owes you for some beers could destroy years of diligence without even thinking.