Tether is the biggest Ponzi scheme in the history of crypto and is becoming increasingly more unstable every day. USDT is subject to many factors, such as the rising and falling value of the dollar and the constant increase of Tether into Infinium to manipulate the price of other cryptocurrencies that are solely reliant upon USDT for purchase.
I do believe that we will see a day in the very near future when Tether (USDT) will collapse and lose the vast majority of its value overnight, much like the TerraUSD/LUNA collapse, except it will be orders of magnitude more extreme as Tether has a market cap that TerraUSD could only dream of, even in its heyday.
If you hold large amounts of TETHER on any blockchain, you're taking massive, unseen risk.