So you need to decide whether they're a risk or not. To me, the idea of having what is effectively a bank with a $60b+ balance sheet that has no auditor and no regulators, seems kind of risky.
We also know, via the NYAG case, that they have in the past, said things that were not true (specifically continuing the claim to have a 1:1 USD backing after they no longer had those funds).
The other aspect of Tether is "who's using them"? There are a range of stablecoins available now, multiple of whom are better regulated and audited than Tether. So why would rational organizations place $60b+ with Tether, when the risk is higher, and it's not like this is an investment where higher risk == higher return.