I think many people discover new casinos by accident rather than actively looking for them. Sometimes it's because a favorite slot is available there, while other times a friend mentions a game they enjoyed. I usually start with games I already know because it's an easy way to get a feel for a new platform before exploring anything else. After that, if the library is large enough, I'll often try a few unfamiliar titles just for a change of pace. It's always interesting how one particular game can end up introducing someone to an entirely new casino they hadn't considered before.