I don't think you can earn much with affiliate unless you have a popular websites where people kept visiting, it needs a great article writing to persuade a user to register under your ref link. If you have a website like coinmarketcap, you may be able to make some registration under you with just a banner displayed on the pages.
Anyway, weren't there an affiliate networks like Peerfly offering BTC casinos too?
I try not to post my referral links anywhere. If a person is interested in that site that I advertise, then he will go in and register at a simple address. If he wants to thank me, he will ask for a referral link in a personal message.