really ? thats way too much but i guess most of them are non crypto based because online gambling were already introduced before when the hype of internet came in but if we will only talk crypto casino i guess that dice has a huge number of players and dice is also popular compare to slots .  i tried stake and bitvest slots , as well as on roobet but you didnt inlcude it on your list but among them i like the graphics shown here by bgaming  . only i didnt tried thier site yet