I could never figure out why people would rather install an app than visit a web page. Many apps are just containers for websites that give the app more permissions than it needs.
That's an interesting curiosity. Why not ask them? There's an extremely high probability that someone you talk to on a regular basis has shopping apps installed. Hey! We could do some research, maybe write a paper. But first, you gotta ask them.
phendrenad2|6 days ago