Warby Parker measured the distance between my pupils by having me upload a picture of my face while holding a credit card. I had to upload 3 pictures because I was too close or at a bad angle twice. I'm not sure if they had an algorithm or if they actually had people looking at the photos.
The glasses seem fine, but the process did make me feel like measuring my own PD would have been easier. I've done it before for Oculus prescription lenses.