I also don't get why online casinos still accept registration from a country where they have gambling restriction. Not all people is aware of such rule and could register to their website.
They don’t do that for two reasons. The first is that they don’t want to lose customers from those countries (more customers=more money).
The second is that they can’t cover all the countries where gambling is prohibited as local regulations change frequently and it’s hard to keep up with the changes.
In their terms, you will see that they always state that it’s the users’ responsibility to verify whether gambling is allowed in their countryies or not to avoid any responsibility on their side.
It is true and I also agree that customers are number one really important in all types of casino gambling online, because this is how casinos survive, if there are no players there is no profit coming in which will result in the closure of the casino.
But there are also other gamblers who are very unaware of the rules of the casino and do not know whether the online casino is regulated or not, which they should also know.