I do not support bitcoin cash too, but you need to understand that Bitcoin cash has low fees at the moment,
and maybe it can give those casinos the same "marketing" if they use bitcoin cash, because it is the same, they are using "bitcoin" only that the forked one anyways.
I think almost all casino will not support or accept altcoin to used in their site, they must prefer the primary coin (bitcoin) in every game in their site. Bitcoin cash is not the good coin for me it is one of shit coin in the market much better to used ethereum if some casino starts to accept altcoin in the future.