If there any kind of illegal activities involved in that transaction then if there is bitcoin bank exist over there then some kind of transactions may be stop by the bank.
Sounds like a joke. Bitcoin is a decentralized coin. If it becomes centralized then what is the point? you mean to say the coin should loss its unique property?
i agree with the statement that there are a lot of "banks" in crypto nowadays. and something tells me that more and more will bring their money to them 
what/can you elaborate the thoughts here?