Totally agree that there should be already at least one huge site and I think this did not happen because those who tried had not enough funds on hand to introduce it successfully.

However, from all what I have seen and read so far, I am confident that your project will succeed, if you have sufficient funds on hand or maybe you can also start an ICO or introduce your own gambling coin that can be traded.

And btw, Game Protect offers an unbiased Mediation service for disputes. This could surely help to establish a trustworthiness instead of having a for players in most cases worthless license.