What I meant is that someone who values their privacy and is going to use a service like eXch is unlikely going to interact with USDT regardless of which blockchain it sits on, so USDT on eXch is somehow very 'not-important' IMO, it's not worth the hassle to maintain it even on an existing blockchain like ETH, let alone run a whole new blockchain just for USDT.
I am pretty sure that there is not a negligible percentage of those who do not use eXch exclusively for privacy and only because of the no-KYC policy. Lately, there have been indications that eXch is also used for day trade due to the competitive rate, so I would certainly not consider USDT as "not important" on this exchange.