Sportsbet has KYC? If so, then I'm out. Sorry, don't want to give my documents even to Binance, not to mention casino.
They have what I call selective KYC. They can ask you anytime but from what I have seen so far they mainly ask for KYC when there is suspicion of multi accounting or if you use fiat.
I have been using them for half a year now (BTC & ETH) and they never asked me for KYC. I consider myself as high roller and never had any problems. Feel free to reach me via PM if you would like more info.
I would probably risk it in your place. 1 mbtc is not a lot of money and if worst happens I would let them keep it rather than do KYC.