I'm a 20+ year Linux/open source neckbeard and I prefer WP as the ideal balance between cost and a variety of ideals it doesn't seem possible to get outside of an iPhone.
My current Lumia 650 cost £60 refurbished, which is a tenth what I'd pay for the next best option. It's fairly trivial to stop a Windows Phone reporting your entire life history upstream, and unlike pretty much any Android handset I ever owned, this firmware receives constant security updates, as did its predecessor for the 3 years I owned it (old phone cost £120).
Seems pretty alive to me.