I believe there are some casino and sports betting crypto site which accepts Bitcoin.
Have you seen Bitbook.ag? If I may ask, why do you like to invest and earn interest on crypto casino sites?
There are ton of them, but there are only few sites which accept investment as well.
I'm not sure if bitbook.ag accept any investment, afaik mostly only dice game-sites which only accept that, ex Bitdice, Cryptogames, mintdice, justdice.