Have there been any cases of USDT wallet blocking by the issuer(Tether) after an exchange on your exchange?
What guarantees do you give when exchanging my BTC for your USDT?
I don't think there is any case of usdt or any other coin from exch.cx getting blocked by centralized
They even have a known address in etherscan
https://etherscan.io/address/0xf1da173228fcf015f43f3ea15abbb51f0d8f1123Remember that your privacy is your responsibility. You can send small amounts to exchanges to test, before acquiring large amounts.