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Don't know if many bettors use btc now when the price is high? Maybe there are still many.
Now it's more USDT because the fees are cheaper and the minimum withdrawal is small.
Because there are still casinos that withdraw with a minimum of 0.001.
What is certain is that there are still and quite a few who use BTC despite being dominated by USDT users.
Those who use BTC usually hold BTC long enough to make more profits and are willing to use it as a gambling bet.
I'm not from a BTC user for gambling, but it's more convenient to use USDT or TRX for gambling because the fees are indeed very cheap.