Data and stickiness. You can scrape way more data from Android's APIs than you can from some cookies on a web page. Grabbing data like "other apps installed",

Data and stickiness. You can scrape way more data from Android's APIs than you can from some cookies on a web page. Grabbing data like "other apps installed", for example. And for stickiness, you can push notify a user to re-engage them. Plus they have to manually uninstall the app to completely "Unsubscribe". It's a better position for a company if they can get you into the mobile app.