That 6% yield on USDT isn't backed by the FDIC like a regular U.S. savings account. Just think about what happened with Celsius and BlockFi; they both went under even though they promised safety. High returns like that can hide risks you might not see right away—Tether's reserves aren't completely clear either. Usually, if insurance reserves aren't enough, they can’t handle big withdrawals.
If safety is your priority, traditional banks' 4-5% APYs are a safer option than taking risks with crypto right now.