They make a lot of money (potentially). They sell USDT tokens which cost nothing to produce for dollars. Then they take these dollars and invest them in vario

They make a lot of money (potentially). They sell USDT tokens which cost nothing to produce for dollars. Then they take these dollars and invest them in various places. Holders of USDT tokens have no claim on the profits (unlike investors in money market funds) so the profits are all Tether's.