I also think that giving the identity and attaching a service invoice with our name and address would have to be sufficient if we only exchanged cryptocurrencies. If the exchange proposes to change with Fiat money in that case for those who want it, it is essential to have to verify your bank account if you intend to pass funds from fiat to crypto or from crypto to fiat. In any case it has to be an option and not an obligation according to my point of view because if you intend to pass to fiat, you will have to provide your bank details anyway.