Unfortunately abusing will not end, even if you have punishments for it. For nearly a decade now since satoshidice started, we have seen people who tried to abuse it constantly. I have seen it when bitcoin was under 100 dollars, now it is even more rampant since the price is higher.
Even double spenders who end up using a million accounts have been doing the same thing, double spend a deposit, wager, if you lose then go with other spending so that you never really deposited anything, then you could keep doing it until you win and if you end up winning then withdraw the money and 90%+ of the time get caught and banned. They keep doing this, been so many years, rarely they succeed but they still try because it is not difficult, and preventing just means "credited after 1 confirmation" and it's done. Abusing a casino will never end, it is just way of people think, and I know how horrible it is and yet some people are still doing it for some reason.
It could be abused, I mean bad people are everywhere and they will try to abuse, but not allowing them to abuse is another deal. I personally believe that Roobet is doing their best to not let anyone abuse the system. Which is why we are doing fine right now, because at the end of the day roobet manages to stop people who are trying to abuse the system.
Of course, it is not easy and some may slip out time to time but in general roobet doesn't get abused because they prevent it very well. It is not important how many people try to abuse the system, millions could try it, that’s not really that bad, the problem is not getting abused, so if people "try" but fail then that’s fine.