Sander I mean yeah it would be super expensive and time consuming if BUNQ had to do it all on their own for sure :)
Though Starling Bank in the UK pretty much launched a marketplace in app, promoted some partnership thing and developers joined up.
Though I am assuming itβs less legwork since the banking protocol cuts out most of the work (like I assume the BUNQ API would for EU customers)
*Then again Iβm not even a developer so I truly have no idea how long or how much work it takes