. We should know what users usually does to a casino that seems to be having bonuses and whatever, people always tends to jeopardize and compromise the opportunities by having multiple accounts, if you look at most cases over here you would see that is either cheating bonuses with multiple accounts and, no casino would permit that without them restricting that person for cheating and is against their ToS.
Sometimes the casino lower their bonuses requirements and make the offer so irresistible that it attracts not just legitimate gamblers but also people who would do anything to explore the advantage they get in terms of violating the bonuses system on the casino. The good thing is that most of the times these efforts are seen and blocked by the casino by restrictions of all account possibly connected to the act.
We can clearly say that it's greed because they offer such bonuses doesn't mean they should go get a means to exploit it on their own, that's why these casinos always regulates their bonuses and try to have an automated mechanism that regularly detects IPs and account connections to limits and terminate them from existing, that is why you see most people complained about their account wasn't able to login any more because the bot has already detected the connections.