I'm seeing more an more of them popping up as of late.
But as i said in the op there is some risk involved short term you might lose some investment.
In most cases someone will come an degen it right back into your investment.
So risking btc when you can get a knock back for your own plays is a decent way to keep your play going.
Instead of just losing 100% of each bet you could get back a decent chuck to increase your chances of winning.
there is a few things when i start to invest in casino, my amount take quite a huge drop cause a whale come in and take a huge hit on the bankroll. however, through time, the profit slowly come in and overall i am in the green.