That's the reason I am worrying but I also realize that the situation now is quite different to 2017 when at that time USDT is almost a dominate stable coin and almost people can only sell their BTC to USDT to take profit, and I remembered that the exchanges in that time hadn't have the service to exchange directly BTC to USD or the currency of their country as now.
USDT has never been the dominating pair for bitcoin traders. The volume has always been so much higher in bitcoin versus fiat pairs. Instead Tether has always been mainly used in altcoin trading and by altcoin traders. If you look at which exchanges have USDT you can see it is "altcoin" exchanges like Binance for example rather than bitcoin exchanges such as Coinbase.