The whole article is about Credit Suisse's lack of due diligence, and the reason why the whistleblower blew the whistle. I find it impossible to believe that the former wife of an extremely corrupt politician in a kleptocracy just stumbled upon one million CHF in a casino.
That's what makes it so telling that the article contains no information whatsoever about what due diligence was or wasn't done and, with the exception of the unnamed cardinal, no suggestion that the accounts were used for any wrongdoing.
As for Nadezhda Tokayeva, who I think is who you are talking about, how much money do you think she should have? For 40 years she was married to Kassym-Jomart Tokayev, the most powerful man in Kazakhstan. Her maximum balance was 1.5 million CHF, barely enough to buy a house in San Francisco. That amounts to a savings rate of 40,000 CHF per year during that time, or 80,000 CHF per year during the 21 years after he first became Prime Minister. That hardly screams "looting the country"; even the president of the US gets paid several times that much officially, without even taking into account speaking engagements and the like.
Kazakhstan is indeed very corrupt, but what do you want banks to do about it? Refuse to service any Kazakh customers? Only service Kazakh customers who operate private businesses rather than working for the government—on the dubious theory that private Kazakh businesses are not corrupt?
This just sounds way too much like "you don't look like the kind of person who deserves that much money" to me.
