Comment by mrtksn

iOS already has a method to associate websites with apps but I see some problems with this approach.

1) If you go with the "associated domains only" approach that requires proof of domain ownership(usually through adding TXT into the ZONE files), you lose the category of apps that function by transferring a session of a website into the app to function. This is a popular approach for reader apps that don't have an official official affiliation with the website they interact with or the website doesn't have an API to do direct app connection.

2) If you go with the route of pre-defined domains that might not be associated officially, you fix the problem in the first point but you also create a vector of attack to scoop data from targeted websites. For example you can collect data from reddit, facebook and instagram. 3 websites only but more than enough to cause headaches.