Not sure if I checked bitkong but I think I have visited tower bet once, long time ago. I know this website is in dark color but what you mean by themed casinos is that you can change the color of the whole page?

It looks cool but it doesn't matter to me at all. What I am only looking forward to a casino is if the games are responsive and the graphics are quite good enough but to some, they may like a specific color so maybe they will prioritize a casino like the one's you are talking about. If the site is too bright or too dark, we can still do a quick fix and that is by adjusting the brightness of the device that we are using. It works like a charm though.