If you think that's a red flag then back your bags and run for the hills. There are many backroom deals and partnerships that the public doesn't know about so if that were true, I wouldn't be surprised.
I'm not even sure I understand it, but I'm now guessing that.
1) Tether is a blockchain (?)
2) Someone must be securing it....but how?
3) Any exchange that uses Tether is backing it on that exchange??