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?
Maybe he is pointing out regulation. But in the first place, cryptos are sometimes used in illegal transactions due to the anonymity blockchain technology is having. Decentralization is in nature of Bitcoin which contradicts the concept of banks , therefore it is quite impossible. Also, there are cryptowallets wherein a user may store his investments and holdings which is already secured. To sum it up, there's no need for a Bitcoin Bank.