USDT is still the grand master of stable coins and it's audited too, I dont know why people are worried about other stable coins because of what happened to UST, we can clearly see how incapable the Luna teams are so do not compare UST with others.
You cannot blame them, since a so called stable coin collapsed and many are afraid right now that it might happen again to other stable coin. Tether also move on its price and maybe the selling pressure are the reason why there’s a sudden dump. Anyway, Tether are more established, I’m pretty sure they have the back up plans now that they have the idea ok what will happen if a stable coin suddenly become too volatile.