The site that pushes you to the app is just for your average idiot to find. A lot of the garbage we find obnoxious is training wheels for those idiots, and they love apps for everything as well. The persistent app nag is a benefit for the target user.
I'll remind you that not everyone who is not very computer literate is not necessarily an idiot. Lots of them just have better (in their opinion) things to do with their time. My uncle who has 2 doctorates is quite intelligent wouldn't know the first thing about reddit and he's certainly no idiot.
The site that pushes you to the app is just for your average idiot to find. A lot of the garbage we find obnoxious is training wheels for those idiots, and they love apps for everything as well. The persistent app nag is a benefit for the target user.