instant deposits were turned off by many bitcoin casinos
Bitsler, Primedice,Stake used to have instant deposits
it turned out that the risks of doublespends and different shenenigans by unscrupulous inidividuals
are too high and this brief wait for one confirmation (and most of the sites require just one confirmation to credit ) is not worth
having to deal with all the troubles caused by potential scammers
I ,personally, am fine with waiting a couple of minutes more