They're not down 80%-90% within weeks. BTC has been on a year long decline from it's $19K peak this time last year. I'm not gullible, people are withdrawing USD using USDT. Thats a stable coin acting as advertised. I've never owned any Tether. But I've never seen so much FUD. Personally, I'm going to be getting some DAI as a stable coin as I like and trust it's decentralized system much better.