> If you really disagree, you can even short USDT, by borrowing USDT on Compound at 4.2%. Then use that to buy USDC and supply it on Compound at 4.9%.[2] If USDT collapses, you'll make nearly 100% as you'll only have to buy back now worthless USDC. In fact the market will even pay you take this position, with the only risk being if USDC collapses relative to USDT.

This trade involves risk, and not just the direct USDT risk. If it didn't, there's no particular reason multi-billion dollar hedge funds wouldn't buy this down to the yield of an equivalent US treasury or similar.