That's why instead of USDT, they'd be using other stable coins that can be also used by their customers.
Maybe for some users, the delisting of USDT from the Cryptoswap section on the Betfury website won't be good news, but overall, it doesn't seem critical. According to the list, there are at least two more stablecoins in cryptoswap. These are DAI and USDC, the availability of which is more than enough to compensate for the absence of USDT.