What I think is the following:
- When the price and volume of BTC pumps rapidly, this means there is a lot of trading going on
- When you trade BTC there are 3 options:
- Trade for fiat
- Trade for USDT
- Trade for alts
Ergo: you need to issue extra USDT to be able to accommodate trading
One could even argue this is a good thing, because if all the people that are trading via USDT would do it via fiat, there would be a dip in total crypto marketcap, which could lead to FUD with a whole lot of other consequences.
Disclaimer: I do not endorse USDT and don't want to say in any way that there is definitely no market manipulation regarding USDT