I just ran into my first reCAPTCHA QR code - one I simply can not solve, as I do not own an Apple device or a device with Google play services. One of those is required to complete the challenge. Let's hope this kind of challenge does not spread, as it relies on people having (1) a phone running specific software, (2) on hand, (3) with an internet connection. A lot of assumptions to make simply to allow someone to view a webpage.