Why apps get rejected in App Review: 2.1, 4.3, 5.1.1 and 3.1.1
Essence
App Review checks a build against the App Review Guidelines. Most rejections fall under a handful of sections, and almost all of them are predictable: a pre-submission checklist catches them.
The rest of this answer, with code and interview follow-ups, is in the DevPrep app.
Read the full answer in DevPrep