After Stake, BCgame is the most popular crypto casino in the gambling industry.
There are many reputable casinos in the industry and probably Stake and BC game were the most popular ones as of then but now there others and 1win is also one of the most popular casino in the industry. And the way 1win is moving, it might even overcome those casinos you have mentioned. One thing is to make the name popular and the most important thing is the reputation of the casino and to maintain the reputation is the highest thing to do as a casino which will like to attract players to itself.
I partially agree with you considering bcgame and stake and 1win are the one confirmed to pay withdrawals worth millions of dollars. This confirmed each time that gambling whales prefer to stay sticked with one of those three platforms or maybe with them all. I remember one year ago bcgame was able to proceed a single withdraw worth $7m. I agree with all of this.
However, since months, we can conclude bcgame to dropped in this ranking considering how many accusations against it which rised a lot of red flags about the credibility and professionalism of the team behind. Most of accusations are about pending withdrawals due to incomplete KYC verification procedures with a poor support that takes long time to interact with multiple issues.