Well, I have always said something, the referral system is something that can be very relative, there are bonus programs where they tell you that you should look for many referrals to earn more money, but they do not say the terms and conditions and among those conditions is that each referral must make their registration that meets their KYC requirement and apart from making deposits or something, and most referrals are people who also want to enter to win, when they tell them what they have to deposit or something like that, the safest thing is that they disappointed or something
That is why I see referrals as a double-edged sword, because if the referrals leave there is no profit for those who seek them, and this causes them to lose, so it is better to read before looking for them, or when looking for them, tell them the conditions.
Even without promos, referrals can "die" if the links are promoted inefficiently.
Honestly not so sure why do they'd join in the first place if they simply plan to bail before making some deposit.
Referrals are simply a 'chance' to earn profit without investing anything other than time convincing people to click or register to something OR getting discount on that platform you are currently playing at; depends on your motive. On the other hand, some people will join because of various reasons; they know you so they just followed your request or they are also interested with what you are offering to them (for example:split on the referral), so I see no problem at all with these referrals.
Rewards are usually for those who are actually playing which are often in form of milestone (playing 5consecutive days etc) or playing again after an interval of not doing so. It could also be in line with a particular event such as with what we've seen on recent Holloween. Point here is that majority of casinos especially online platforms will use any of there reasons not solely to give money on their players but to attract them towards playing more