Can you clarify, this 2-3btc is your average amount per bet or just your total bet for 2 years? As per sportsbet's term, they will ask KYC for withdrawal above or equivalent to 1btc. If the 2-3btc is just your total bet amount so I believe they wont ask you for KYC as I also using this site for few years already but with small amount only. How much was your biggest withdrawal here?
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-conditions
3.3.3. 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.
i withdrawl more than 0.4 btc and they never requested for kyc