Understandable move and might turn out to be good in the mid-term (in a non-speculative way)
Since when banks decide what people can buy with their credit cards? Is bitcoin illegal?
It might be their credit card but it's still the banks money, even though I believe in Bitcoin and recommend investing to people I wouldn't give them my own money to do it.
You're allowed to invest banks money from your credit card in Vegas casinos but they don't allow you to invest in bitcoin because of... too much risk... Really? Only retarded can buy the "risk" argument.