A credit card can be used to get into an adult entertainment show, but they cannot be used to buy bitcoins? I find it strange that banks are okay to fund expenses, but are not okay to fund risky expenses.
Adult entertainment isn't a potential threat to the entire banking system, where Bitcoin is exactly that. These pussy banks hide themselves behind all their nonsense reasons and arguments to not openly admit that they just want to slow down Bitcoin's growth. No one can stop people from buying Bitcoin, even not with these measures in full working state. People can cash out money at any ATM with their credit cards, and have that money deposited on their bank account to wire that money to whatever exchange, or use that money to find local sellers, and believe me, there are many of them fairly nearby. Bitcoin is unstoppable, and it's time for financial institutions to accept that and deal with it.