[david-gpu]

The company that issues tether can invest the proceeds into a money market and get some meager interest. If that float is large enough, they can make a killing in absolute terms. Presumably that's what the grandparent means.

[skookum]

The company that issues Tether can issue it without receiving any USD. If that issuance is large enough, they can make a killing in absolute terms.

[throwaway66920]

notably tether doesn’t guarantee the right to redeem the tokens for dollars, so they can do whatever they want