Why casinos let you register, although your country is restricted?

[liamsmith123]

Vegas Sweeps 777 may allow registration from restricted countries due to system limitations, but game access or withdrawals can still be blocked to meet legal requirements.

[MilaRoy]

Hi I have a lot of experience in gambling, so let me explain, why so?!
Online casinos often use a registration process that doesn’t immediately verify the user's location. As a result, players can register from restricted countries if the casino's software fails to detect their true location at the time of registration.
Ultimately, in countries where online gambling is illegal, such as Costa Rica for instance, offshore online gambling companies are permitted to legally operate their business from the country, but they are not permitted to offer gambling services to the country’s citizens.