It's anecdata, but none of the retail crypto speculators (five or six now) I've spoken to IRL have even heard of Tether.
That's only an issue if they blend USDT and USD balances together, which to my knowledge they don't. If you sold a bunch of your bitcoins for USDT rather than USD (which seems unlikely, seeing that BTC-USD has 28x the volume of BTC-USDT), and USDT goes bankrupt, that's on you.