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.
Exactly, 1xbit was actually a licensed casino, they were still have license during many gamblers accused them for confiscated their money.
I remember there was someone tried to sue or report 1xbit in order to get his money back, I don't know how real is it, but there was no news I heard 1xbit returned the money.
So yeah, both of them carry the same risk, it just the popularity that I think make people convinced their funds and identity are safe. It's the same why people can trust their money in popular centralized exchanges.