There is nothing in our world that is stable. But the transfer to Tether was necessary before the collapse of the market. Now there is no special meaning in this. About security. They conducted an audit, and all their coins in the required percentage are confirmed by real money.
That is indeed the odd thing, because when you take a look at the latest published articles about this subject, especially the "news media", somehow there's the general perception that this is all going to fail. Until a bit earlier I actually thought the audit still had to be done, because even now articles are popping up with that.
The chart says otherwise, it's still correcting and there's little variation in the rate USD/USDT.