I recommend that you familiarize yourself with the affiliate program
https://game-revenue.eu/, which will give you the opportunity to make great money. All you need to do is find traffic for their casino
I'm not quite familiar with the site you posted here but I don't think bitcasino needs that since they are already successful and for that they already gain more revenue for this business, Maybe you should offer that for those site who's starting up since they will need this for their survival since establishing a new sites got more struggle especially in financing side.