Wow, why did USDT change to 6.95?

What is the reason?

1. The impact of the policies on stablecoins jointly issued by the six ministries before? OTC merchants cashing out without considering costs?

2. The largest gray market guarantee platform, Huiwang, has oil flowing out of the market, with rumors outside saying it's being bought at 70%?

3. Is there a problem with Tether, the issuing institution of USDT?