The worst thing of this time is that the casinos must have some type of license to work and unfortunately I think that's not needed that much. The games are widely available by game providers which a new casino can implement into their platform, but I still believe that the ones who build their own games will have priority over the others.
I personally have come across some really good casinos, well structured, beautifully designed and so, but not very many people playing there, which brings me to the issue of marketing, this days, without adequate marketing, some one who owns a casino is as good as the person who does not own one, a person can spend let's say $20,000 to build a world class casino, and would spend hundreds of thousands of dollars on marketing because, marketing is a never ending expenditure for online gambling casino, for the day you stop marketing, you start losing customers gradually.