Staking becomes risky. It is possble to lose all your USDT. Just remember the situation with Garantex. Such situation can happen with every exchange. And how it is possible to trust Tethere where you coins can be frozen.
One of the biggest problems facing Tether and increasing the lack of transparency of the company is the company's cash reserve. For at least 4 years now, there have been many rumors that the company's USDT stock is not 100% backed by real cash cover. This causes a big problem, as what gives Tether USDT value is that it is backed by a dollar cash cover that maintains the currency's price against the dollar. Since the company's digital currencies are not 100% backed, this means that the price of the Tether dollar against the US dollar is supposed to decrease.
The biggest problem is that so far, no official audit has been issued by Tether regarding this matter. The company has repeatedly denied these rumors and claimed that all digital dollars have a 100% cash cover. However, the company has not issued any reports proving this in the past period. Until now, many investors are still waiting for an official audit report proving that there is a cash reserve supporting the Tether dollar.