You must be new here. Exit scams happen all the time in Bitcoin. There have been dice sites that exit scammed without legal consequences.
As for your claim that "They can make more money if the site is keep growing", let's look at it.
Someone recently suggested that the site makes 6% per month returns on its bankroll. The site itself only takes a 10% commission, so the site is earning 0.6% per month. That means that if things stay at their current state it will take 100/0.6 = 167 months = 14 years for the site to earn as much as is currently in the bankroll. So the choice is between stealing the bankroll right now, or working hard for 14 years, for the same return. I realize I'm ignoring the fact that a lot of the bankroll isn't real money, but is leveraged funds, that the 6% per month if real is unsustainable, and that the site is currently paying more in referral payments than it is collecting as commission but I think my point is still illustrative of the fact that exit scamming is lucrative compared to running an honest site.
If the site does keep growing, then presumably so does the bankroll along with the betting volume. The amount that can be stolen increases along with the weekly commission amount. Perhaps your statement would be better written like this:
"They can make more money by growing the site for a year before stealing the bankroll than if they steal it right now"
I'm not saying that YoloDice is planning to exit scam. I don't know if they are or not, and neither do you. All I'm saying is that your argument is invalid, that exit scamming pays well, that it has happened before, and that the scammers were never (to my knowledge) caught.
Yes exit scams happen, but only with small sites, because they can't get enough players to be profitable. But yolodice is new site, and they already have loads of players. The site takes 10% commission, but they're also investors, so in reality they're making much more money.