You would be surprised how many "popular casinos" use that tactic to stuff their pocket. And, the same casinos eventually, start to screw their players by taking their money and if they win, not paying.
Just saw that some accusations for fairgo on casino listing forum caused by the site didn't paid the winners. This may happening with the rest in your list as well. So many players have problem with fair. I can't still get why you called that as a good crypto casino site.
Fair go was also doing shady thing as well to its players.