As if a casino with license can not do it? I think nothing stops any casino from disappearing suddenly or announcing bankruptcy. Those who have money and power with help of lawyers will drag something out from such situation, but majority, who kept money there, will only complain and do nothing. By the look how people are careless about their money, how lazy they are when it is time to fight for their stuck, frozen or stolen money, it makes no difference if it anonymous or centralized casino with licenses.
Oh casino with license can do that easily and we already see some on this forum. But it is not many casinos want to announcing they will be offline and will not operate anymore. Yes, nothing can stop those casinos from disappearing their business forever and their member can only regret they still have money in that site. It is why if you want to playing gambling, you must always remember using the money you can afford to lose so if something bad happen with the casino, you will not feel too regret.
Anonymous casino platforms use names similar to popular casino sites and use various social media and traffic to promote themselves so that they can easily trap a number of people. You should be careful of those fraudulent casino sites to reduce the chances of losing money. I try to get my entertainment from those reputable and reliable casinos that are consistent and trustworthy. A friend of mine told me about such a fraudulent casino site and he lured me by telling me that he would earn money from it but after a few days they got that site shut down and my friend lost a huge amount of money. Even I warned him about the new casino site.
That make us more carefully to check the domain name before we decide to playing gambling on that anonymous casino platforms. We must take responsibility to our money and not just deposit in an unknown casino that can make us get the scam. Many anonymous casinos out there but not all of them can give their best services to their members so we must research before decide. Your friend make a mistake by not research furthermore about the casino and lose his money. It is no problem if that money is small amount, but if that is a big amount, we will regret it and feel sad.