This is pretty stupid if you ask me, the top of the list is just stable countries with a strong tradition of rule of law.
Whether it's "stupid" or not depends on how much you weigh bank secrecy and privacy against the fight on money laundering, corruption, terrorism financing and sanctions evasion.
Either way, the degree of secrecy you get is also usually a lot higher if your assets are not in your home country, which means that bank privacy is much higher for the global rich.