Cash has slower transaction speed (snail mail vs <30 min). Requires additional supplies to use (pen, stamp, envelope). It’s illegal in the USA to send cash in the mail. No way to get delivery confirmation without risking deanonymizing yourself.
https://www.snopes.com/fact-check/sending-cash-u-s-mail-ille...
Cash has slower transaction speed (snail mail vs <30 min). Requires additional supplies to use (pen, stamp, envelope). It’s illegal in the USA to send cash in the mail. No way to get delivery confirmation without risking deanonymizing yourself.