Not Revolut’s team, but:
-One verification method for determining the legitimacy of the debit/credit card is taking a photo of the card via the camera. Given how a virtual card is virtual, this cannot happen.
-The physical confirmation (via the photo.) is important, as it reduces the instances where fraud occurs, whereby virtual cards that have been stolen are used to top-up pre-paid cards and then spent instantly. The fact that the card is physical means that a third-party (The issuing bank.) has already done their KYC/AML checks, therefore ensuring that the integrity of the financial system is intact.