And some institutions are not allowed to use any services to unregistered customers. In this case, if you want to access gambling, you will have to register with the casino.
Note that some sites as PlayCasinosCa offer a single registration system for clients, while others allow you to open training accounts separately, according to a simplified scheme. In other words, if you are not going to play for money, you will only need to come up with a login and password, and also specify a contact email address.
More information on this issue is available in the article "How to play in a casino for free?", Which discusses all the subtleties and possible nuances.