Don't know details of Binance, Tether or others. But at this point, it would be prudent to pull all except your in-play trading chips off the table into self-custody no matter what exchange you are using, until this whole kerfluffle is sorted out.

I wonder how crypto exchanges can guarantee non-hypothecation of customer funds in a DeFi trustless manner. The methods I've heard about still are tradfi-style centralized mechanisms that can still be subverted, and do not leverage crypto currency's strengths, though I'd sure like to be pointed to any exchange that has really figured this aspect out.