Great article. Would love to see something in this vein for App Store apps.
The elephant in the room: Facebook Pixel and the Facebook SDK.
I've held strong and refuse to add the SDK to our app. Or any Facebook integration (to the website). But per my marketing friends, we're essentially wasting our money on all our Facebook advertising. For better or worse, ads are very important for our consumer-facing product (https://www.joyapp.com).
The fact that 90% of apps out there have what many consider spyware should alarm more people. This is even if you don't use Facebook sign in![1][2]