This app allows you to see victims whatsapp messages by simply scanning the qr code and is the potential reason for many break-ups. Now privacy of a subject, his/her digital privacy is the most appropriate word has been the reason of headache for many countries governments and this app is like adding oil to the fire and doing havan.
Should we or should we not is a moral question but if the app like this allows it I think the morality and many principles goes down the drain. Do I support this no I trust my partner.
After all any relationship is build on trust and respect. If one wheel of a 2 wheeler is missing it wont run right.