Betroar.io?
$2 for referring one person or for many referrals?
You should check the site's Terms of Service
https://betroar.io/terms-of-service I think the issues concerning referrals are mentioned there.
The part concerning referrals:
BetRoar reserves the right to implement a rollover system wherein bonuses such as, but not limited to, 100% Match Bonus, 50% Rollover Bonus, 200% Paxful Bonus, Founder’s Faucet, and Referral Sign-in Bonus, would prevent users from withdrawing until they have bet certain amount of bitcoin, or they ran out of bitcoins in their account, whichever happens first. The Referral Sign-in Bonus would be an exception, where the user will be able to withdraw once all of their referral sign-in bonus have been depleted. The following are the rollover amounts of each bonus type: 100% Match Bonus – 25 times the deposit plus the 100% match bonus; 50% Reload Bonus – 25 times the deposit plus the 50% match bonus; 200% Paxful Bonus – 75 times the deposit plus the 200% match bonus; Founder’s Faucet – 25 times the bonus amount received; Referral Sign-in Bonus – 30 times the bonus amount. Users have the right to accept or decline the bonus. Declining the bonus would not trigger the rollover system. Bets on games with -200 (American Format) or 1.5 (Decimal Format) odds or lower are not counted towards the rollover on any of the game modes currently existing in BetRoar (in Brawlers’ case, the odds that will be considered in this qualification is the player’s personal...