Seriously. I don’t want to install something on my phone when the dev is just using a WebView, if that’s what it’s called. When the app is basically just a website with the browser hidden....
I would say in some cases, people are conditioned now to expect an app, even if it’s basically a website. I think in a mobile context, most non-techy people don’t normally think to open up a browser and say, browse Amazon or something. Instead they go for the Amazon app on their phone, and browse/shop/whatever there.
I wouldn’t say this is exclusive to phones either. I once worked on a product that was essentially web-native, but they had to ship a desktop app because their market expected it, even though it was only a web-view wrapper to the website. No offline storage, no difference in behaviour, or need for some specific API; nothing. I guess you try explaining to boomers that a web-view desktop app is unnecessary.
The data vacuuming and additional marketing are just added benefits for the app developer, if they go down that path (they usually do).
Why are there so many apps that could be websites?
Seriously. I don’t want to install something on my phone when the dev is just using a WebView, if that’s what it’s called. When the app is basically just a website with the browser hidden....