Ah, sorry, Swipp was the Danish MobilePay competitor that died due to Danske Bank's disgustingly unfair play (they were part of the Swipp group, but started MobilePay development in the background and launched before Swipp did). I was of course referring to Swish.

MobilePay passed 3 million users in 2016 (out of ~7 million people). I don't have any updated statistics.

Anyway, with your added numbers, it is quite clear that at least in Scandinavia, person to person transfers are very common.