Interesting so they’re offering a wholesale rate to individual consumers 
A couple of things worth noting -
From the Money Saving Expert Article
There are no spending fees, and no ATM fees on withdrawals up to ÂŁ200 or equivalent per calendar month, but a 2% fee applies above that.
Whereas Monzo doesn’t charge for ATM withdrawals (although it does limit withdrawals).
I also did a quick Google search & found this blog with compares the MasterCard rates (N26’s) with Revolut’s & found that in some cases the MasterCard rates will be better & in other’s it’ll be Revoluts. Either way, apparently it’s marginal.