There are a lot of casinos now and players have a choice in which casinos to play. You are right, many players do not look at the license and other casino documents, just as they do not read the rules for using the casino.
To organize a casino is a profitable business. That is why a new casino appear very often. But the demand in casino continue to be very high because people line to play casino to check their fortune and luck.
People wanted to check their luck in all the times that is why casinos are so popular and the demand in casinos continue to grow.