CryptoCurrency: Trading BTC and using USDT as base currency. is it permissible

As-salamu Alaykum, If I am not wrong the list published my IFG (https://www.islamicfinanceguru.com/crypto/) has listed Tether as “GREY”. My question is :

> Will it be permissible to trade any other coins with having USDT as a base currency?

Jzk

i would like to know also