I noticed that one of the casino I work with converts well, but has noticeably poor retention rates. So I asked their affiliate manager to send me a detailed activity report of all referred players. And it turns out many were shown as "blocked".
I then asked him why this implicates, and he said that it can be due to those players "self excluding" themselves, which makes no sense. I've never heard of gamblers self excluding or volunteer to close out their account, unless they're unhappy with the operator (which is not the reason in this case).
So this is suspicious to me, and I like to know if anyone else encountered this problem.