If a company doesn't allow you to test their security, just let it go.
I think offering gambling games as a business should be illegal but as long as it's legal the casinos deserve the same protection from people trying to abuse contracts as everyone else.
And consider the usual case at a normal "manual" craps table: if someone tried to slide the dice, or throw them in a way that wasn't allowed, there are three (and sometimes four) casino employees around the table who will quickly call "no roll" and tell the shooter what they did wrong, and have them go again. If they keep doing it, they'll get kicked out. No need to involve law enforcement here.
But once we talk about an "automatic" craps table -- which exists mainly to cut down on labor costs to the casino -- now they're pissed that they failed to enforce the rules properly, and have -- through their clout and government legal capture -- turned that into criminal charges against the people who slid by.
I know I've been arguing the opposite in other comments, but in this case they apparently didn't actually agree to the rules of the game, and yet they chose to play anyway: the rules do state that sliding isn't allowed, and that the dice have to tumble in a certain way for it to be considered a valid roll.
Regardless, though, I think it's the casino's responsibility to ensure rules like that are followed, and if they fail to do so (due to cost-cutting measures like having software run a craps table), that's on them.