I think you're right about slots and dice. They're basically taking a non-provably fair random number and then shifting it by a provably fair random number. I could be missing something though, I can't find the actual code posted anywhere and I haven't really looked into their slots too much.
Thanks, my focus hasn't been on provably fair implementations lately, but figured there was a chance someone developed a new exploit against these types of which I hadn't read.
I hesitate to respond to the previous two posts, but I'm a security researcher and I expect to lose small amounts of crypto with these sites. I make a whole lot more than I'll ever lose disclosing vulnerabilities to site operators and game studios. Publicly reporting anything at all about a site is not in my best interest, but I do publicly report a site's poor behavior to this community anyway. Implying I'm "stupid" or lack common sense is pretty uncalled for, and I hope anyone with that attitude considers their words more carefully before making such posts in the future.