How do you propose a direct payment or cash without giving a buyer your bank account number or address, which you may not necessarily want to do for privacy and

How do you propose a direct payment or cash without giving a buyer your bank account number or address, which you may not necessarily want to do for privacy and security reasons? And mailing cash isn't very efficient or practical. Payment brokers are always going to be a point of failure. But also, it's about pragmatism: can you name an existing payment broker that fits the criteria? If not, what option are they left with other than to use cryptography as their broker? But, yes, it's often about avoiding certain kinds of regulation. Regulation isn't inherently good or bad. Some regulation is good in some contexts and some is bad in some contexts. Cryptocurrency lets you enforce your own absolute regulation for cases where legal regulation isn't able to easily help you (like in this scenario).