As already written above, the main problem of USDT is the possibility of freezing.
But this is not relevant for all blockchains.
This possibility is kinda expected, they had to do that to be allowed to operate. Otherwise, they'd face a lot of problems with governments.
Tether is likewise a centralized firm, and the company follows regulatory compliances. Since tether is a stable token issuer, the company must follow the rules by the regulator in order to get regulatory approval to operate their service. Certainly, tether has a function to blacklisted the dubious wallet connected to the illicit activity. Notwithstanding all of tether's pros and cons.
As long as we did not do something illegal, a blacklisted trait owned by tether is not a major issue; hence, we should be worried about that only if we did something unlawful. The government constantly orders the centralized firm to guarantee the safety of its users. One of the preventive measures possessed by tether to freeze the wallet used to gather the dubious money.
That function, which tether is developing, guarantees the offenders won't be able to spend the money from their crimes. In summary, "one of tether's concern to its users".