The TOS says
Applies to all active Sportsbet.io accounts.
So yeah I think the cash is yours without any strings attached

No no, their fantasy regulator requires to let everyone in (deposit), but ask for KYC for withdrawals, because of AML laws!
Hi all,
Regarding the complaint of player ExcessTest:
sportsbet.io is a regulated online gambling provider which does not withold customers funds and processes hundreds of withdrawals of BTC in a week.
Regardless the nature of Bitcoin payments as a
regulated operator we are obliged to ID verification, KYC and AML (anti-money laundering) procedures by the regulator at certain withdrawal levels.
We have stated this clearly in our Terms & Conditions page available here
https://sportsbet.io/about/general-terms-and-conditions3.3.3. Sportsbet reserve the right to carry out additional KYC verification procedures for any withdrawals exceeding the equivalent of 10 Bitcoins or 2300 which ever is lower, and further reserves the right to carry out such verification procedures in case of smaller withdrawals, as demanded by our gaming license. Account Holders who wish to recover funds held in a closed, locked or excluded account, are advised to contact Customer Support.