a license is not a guarantee for a casino to behave fairly to its customers in terms of games, because there are many gambling platforms that have a license but they cheat, it is not a few who do that, yes it can be said to be a third party game to make people believe that they have a license that they do everything fairly.
Yes, we may be able to see that those who used to have no license but were able to operate the casino fairly are not a doubt that when they get a license they will do the same, it should increase their confidence that they are doing it fairly in running their services. But in any case we should not be too sure because something could happen someday, I don't mean to do FUD but being more careful is a better attitude than being too fanatical.
And all the governments that require every casino to have a license means that they assume that bitcoin and others are currencies, roughly speaking, can you say that?
Maybe getting a license is only their way to attract users before they show their true face, so that it will be more worth it but there might be some who are genuine at the start and only changed later on. Most casinos can start with no license because they don't have a budget yet and then a license is mainly required when the size of the casino have grown a lot.
We don't need something like a license only to increase our confidence of becoming fair but it should come within our selves. Bitcoin and other cryptos are currencies but it's not the main reason on why the government requires a license to a casino but it might have to do with the tax.