the problem is only for RTG (and a few other) casinos which allow players to open multiple accounts(and don’t have any payments verification). I prefer CPA for RTG with n/d with the risk to sell a 10k player for 50b.
It’s not a problem for microgaming casinos (except Referback).
to Dominique in the case of RTG casinos a coupon code must be used in order to receive a bonus :p