It's really hard to get a good number of referral share especially if the requirement doesn't only find people who download the app and create an account, but they're also ask minimum of wagering amount and the share is depends on the user's lose. Which mean if the user doesn't do any deposit and making money, you wouldn't get anything. There's few casinos have such affiliate system and it seems it's higher chance to get abused by creating multiple alts rather than find a new users.