Actually, I was flagged over $6000 deposit over the sale of a car.
The IRS gives rewards to bank employees if they report (successful conviction) any suspicious behavior.
I still don't know why I was flaggged. Probally because I had long hair at the time?
I had a bunch of sleepless nights over that incident, and a bunch of emails back and forth.
Internet file sharing is older than you think. Together with remote terminal access (TELNET), file transfer (FTP) is one of the oldest Internet protocols. When file transfer over the Internet first started, that is, when the Internet itself started, it was not "illegal".
Biggest eyeroll in history.
I don't think what the government calls "drugs" should be illegal, but, selling and buying drugs with cryptocurrency is an oft advocated for activity that I've seen in these communities.