Some of the emails had the subject line, "Think Twice." They were sent from a spoofed email address. The sender claimed to have had an associate plant a small bomb in the recipient's building and said the only way to stop him from setting it off was by making an online payment of $20,000 in bitcoin.
The sender would have accepted $20,000 in any crypto-currency.
It is clearly stated that online bitcoin is accepted.  The system may not see a difference between bitcoin and cryptocurrency.
( z1 accept :ARG0 ( z2 person :ARG0-of ( z3 send ) ) :ARG1 ( z4 monetary-quantity :quant 20000 :unit ( z5 dollar ) :prep-in ( z6 currency :mod ( z7 any ) :mod ( z8 crypto ) ) ) )