I'm not sure where else to vouch for Sportsbet.io but I deposited 1 BTC and won 4 BTC by playing Live BlackJack, they did not KYC me for such a large amount.
Follow their TOC and play legit and you won't have any issues using them. I also do Sports betting with them.
https://i.gyazo.com/8b72e8b75a39fcfaaab1c7bb7d55240e.pngIt’s against their own terms and conditions to not KYC you for such a large win, in line with their gaming license.
9.2. Sportsbet.io reserve the right to carry out additional KYC verification procedures for any withdrawals exceeding the equivalent of 1 Bitcoin or €2000 as regulated by our gaming license. Account Holders who wish to recover funds held in a closed, locked or excluded account are advised to contact our Customer Support.