I agree, Stake and sportsbet/bitcasino is good enough if you're only betting on the popular tournaments but if you're craving for those less popular leagues then nitrogensports is the way to go.
^ I would go with Sportsbet.io for esports, there are plenty and a variety of games on this casino.
However, this is not an ideal casino if you are in US and UK, there are heavy restrictions when it comes to betting using cryptocurrencies like BTC and other altcoins. Then, probably that is the time unKYC gambling casino is the suitable for you if you are these countries.
The good thing about this casino is they supported other payments like Visa, MasterCard, Ecopayz, and PaySafeCard, but for me, I don't want to link my personal account.