Stake.us doesn't pay out real money for wins on their site. They award Stake Cash, a type of virtual currency which you can collect and redeem for gift cards, cryptocurrency, and other rewards.
Crypto staking comes with risks. There are several drawbacks to cryptocurrency staking: Your assets have limited or no liquidity during the staking lockup period. Staking rewards (as well as staked tokens) can lose value when prices are volatile.