What feature is actually requested here?
Slicing a bill with non bunq users? That is already working by going to the payment receipt details and tapping āsplitā. There you can add people you want to split the bill with, either from a list of known bunq users or by adding the phone number of a non bunq user.
Or the ability to add non bunq users to a split group? Because that seems to be limited to bunq users only. I wonder how that would work with non bunq users to be honest ... I have never seen or used the now cancelled split app so I donāt know how that worked but I would assume every split group member would need to have some sort of account to access the group? And what exactly is the functionality that group members get? Managing group money should only be possible for members that are sufficiently validated, which would mean that non bunq users would still have to create some sort of account and provide the necessary identification ..... so for all intents and purposes that would mean bunq would have to bring back a free or at least a limited type of account.