Stake is indeed of the biggest casinos with a lot of high rollers but the majority will still be small gamblers who will think that a 10$ fee is too much. Guess we need to wait and see how popular USDT becomes and hopefully they still condider adding alternative networks besides ERC20.
I think, the withdrawal transaction fee has dropped to $5, but it's still the highest, I just don't know if it will still be the same using either of the two currently supported networks (ETH/BSC) or if it will change before the process starts. I haven't tried it yet. BEP20 is enough if we are just talking about a low fee.