@gustav
Many times when a user is using an m-site, they are directed via deep link to the App Store to download the app, with no warning. (USA)
However, if the user was using the m-site, it is unlikely they want to download the app, ex. they only intend to use it once. They would be giving up lots of permissions for low utility.
The reason companies do it is because developing for m-site is along with app is expensive.
Disliking deep links is a utility and privacy issue.