Or even perfectly legal, not-unethical things which are not liked by your payment processor. Many will not process payments for firearms or firearm parts, and a whole host of other things which are perfectly legal; MasterCard (whatever your opinion on the validity of their choice) has coerced Patreon into shutting down the accounts of people whose speech they don't like.

A "cashless" system is one which requires a hell of a lot more regulation on payment processors, or a true virtual equivalent of fiat cash which doesn't involve the policy or whims of processors (or maybe a considerable deregulation, which allows individuals and upstarts to afford to process payments).