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From what I know there's only one field of online gambling were it is still possible to create something which will be in demand among gamblers. It is poker. With the recent closing of poker section by established gambling sites a niche has been created and I constantly see like poker fans play on crappy sites just because they love the game. I'm talking about poker tournaments and table games where people can play against each other, not about video poker which is more like a slot game to me.
There are actually gambling sites that do offer poker but later on they do remove it due to lack of demand.I agree there are really gamblers who do seek out these card game but not totally even on those dice or slots.
If you mean that among gamblers there are much more admirers of dice and slots, then I agree with you. But what I meant is that poker segment is disproportionally smaller currently, and that there's real demand for high quality poker games. Idk, maybe it's expensive to maintain such games and it turn out to be unprofitable eventually, and maybe that's why many established gambling sites have closed poker sections recently, but, if that is the case, then we should look for platforms which are cheaper to maintain, because I'm sure that nowadays a good poker site is able to make good money.