I really don't believe USDT Tether is a scam because it's use had saved thousands of Crypto investors from losing their Crypto Assets and investments.
I myself had used once USDT Tether in order to keep safe and save my crypto assets from dropping it's market value especially this year that Bitcoin dropped drastically and every altcoin's are dropping together.
You're lucky because they have hidden surprise in it's legal section:
Once you have Tethers, you can trade them, keep them, or use them to pay persons that will accept your Tethers. However, Tethers are not money and are not monetary instruments. They are also not stored value or currency. There is no contractual right or other right or legal claim against us to redeem or exchange your Tethers for money. We do not guarantee any right of redemption or exchange of Tethers by us for money. There is no guarantee against losses when you buy, trade, sell, or redeem Tethers.
https://cointopper.com/guides/what-is-tether-usdt-and-how-it-can-help-you-save-yourself-during-crypto-bear-market