It's probably just something to take note of that if it isn't physically backed and we see massive volatile moves then don't trust it to peg the dollar especially if it keeps getting a higher and higher pool of funds that are thought to control it (its a shame a lot of sites use it in futures).
Honestly, I've seen a lot of statements about usdt being a enormous scam project and as far as I know they're being sued or investigated on this matter.
I won't believe it until its proven so