well I understand your points. I believed referral bonus is given to someone when the customer refer the site link to a friend. And I have been receiving such email from casinos but I ignore them. While welcome bonus is the one we get when registering to a new casino site but I registered to a casino recently which promised me to to give welcome bonus but I didn't see anything. That is not withstanding. Many gamblers join some casinos because of the bonus while some abuse these bonuses. Though some use it to win big, that is their luck.
Well, if you carry out your research carefully, you will spot the sincere and legit ref bonus driven campaigns by some of these Casinos and it will keep you streamlined to serious casions rather than signing up for silly ref bonus promising casinos. On the second hand, they have ref bonuses as a pool, but that information is for internal consumption alone. Once thier pool is exhausted, they come up with strategies of disqualification to satisfy their reason for not awarding you the bonus, at that point, you have already done your part which is a plus for them, that's what aches me the most.
This kind of behavior is mostly exhibited by scam casinos since what they care about is to steal from their customers and if they find out their secrets had been exposed, they will have no option than to delete the users account and leave no trace for the users. Being careful is what we need to keep eyes on so that we are not going to be a victim of bad casinos that will deprived us of all our struggles after referring users to the casino and not getting compensated. If we don't he same in a reputable casinos, we might even get more bonuses from the team from being a top referrer.