That may be happening to Tether now. Take a look at Tether's market cap chart.[1] Click on Overview->Market cap-> 1 month. You can see the cashouts. Between 5:09 AM and 5:14 AM on May 27, 2022, the market cap of USDT suddenly dropped by $750 million dollars. There have been five huge cashouts like that since May 13th. About 12% of Tether has been cashed out in the last 3 weeks.
This never happened to Tether before. Until now, market cap was "line goes up". Biggest previous drop in market cap was about 1% in mid-2021.
So, how long can Tether pay out 4% of its market cap per week? Looks like we're going to find out.