It feels weird to me that biometrics is included in the free tier on iOS, but not for the Windows Desktop app. I can imagine it has something to do with licensing costs, but I'd say that it makes a lesser user experience and makes it harder to communicate features for the free vs. the paid tier. I say make it free for all apps, regardless of the operating systems. It's something people expect to be able to use. Maybe more so on iOS, but Windows Hello is on the up and up as well.