I see a lot of requests for a bitcoin wallet, but no-one offers any rationale. What does it add?
bitcoin is an investment vehicle at best and it has nothing to do with the area bunq is active in (managing bank accounts and managing how money is spent). Even when you ignore the focus mismatch and the well-known compliance concerns, bitcoin is a waste of time for bunq to spend any time on now, since you can hardly spend any bitcoins at merchants nowadays.
Only when merchants start accepting bitcoin on a large scale, would it be useful for bunq to allow people to transact using bitcoin. That situation can only be resolved by merchants and payment service providers who currently don't accept bitcoin. One of the reasons for that is that the transaction speed of the bitcoin network puts a break on bitcoin being accepted as a payment method and that means merchants run a higher fraud risk. When you're paying for groceries, it's unacceptable to have to wait for an hour before you know a transaction has successfully completed, so payments will be approved with some fraud risk.
Without these conditions having been met, all bunq would be doing is build a wallet which customers could quickly top up with EUR/convert back to EUR (facilitating investing). That would only slightly speed up the fx process but add nothing new (fundamentally the bitcoin exchanges already offer this service) and at the same time it puts bunq under close scrutiny of the Dutch Central Bank (DNB), since bunq as a bank could potentially be used to anonymize/money-launder huge sums of money with a direct link to DNB and/or ECB payment infrastructure.
So, we go back to the initial question: apart from building something which is hip and sounds revolutionary, but adds nothing new: what does it add?