Bisq does not collect your bank account info. There is the concept of "account signing" when you want to trade an amount above a certain threshold amount that is required for certain payment methods (e.g., bank transfer). Essentially, it's like a vetting process -- you do a small trade with a seller who is signed, and after that trade completes and time has passed your account will become signed as well. After that, you are permitted to trade higher amounts.

More details here:

But you never send payment to Bisq, only to the seller (your trading counterparty, or "peer")

Of course, the seller will have information from your bank transfer which reveal some of your identity. But the bank doesn't know that the transaction was related to a Bisq trade.