As far as I know, the world of gambling didn't have many fans, only certain people liked to gamble.
as time goes by, with today's sophisticated technology and in addition to the gambling industry, many are using deposit and withdrawal methods with crypto as it is today, things will happen as you can imagine right now.
Actually it's not gambling that many fans, on the contrary Bitcoin is a lot of fans, with Bitcoin gambling it's easier to bet on, having $ 10 currency in Bitcoin you can already bet, that's all regardless of all the risks, if you talk about risk, of course gambling is a bigger risk than Bitcoin, but because many fans are caused by the convenience of Bitcoin in making transactions rather than fiat.
Both gambling and Bitcoin are two different things; gambling is something that people do and it has been around for centuries because people like doing it even if it causes them money and it has an addiction, as well which makes people get involved more often. On the other hand, Bitcoin is a cryptocurrency that has functionalities of its own but it is not something related to Bitcoin other than the fact that it can also be used for gambling purposes just like fiat.
So gambling has always had more fans because it has been there when there was no Bitcoin, but after Bitcoin came into being, people started creating casino platforms that accepted Bitcoin as a currency to be used for gambling, so more people started gambling using Bitcoin, and there should be no surprise if gambling has more fans than Bitcoin because it has been around for a much longer time.