The new year was supposed to begin with a brand spanking new calendar app. But roughly 72 hours after the premium email service Hey announced its latest feature — an integrated calendar — co-founder David Heinemeier Hansson received some unwelcome news from Apple: it was rejecting a standalone iOS app for Hey Calendar, because non-paying users couldn’t do anything when they opened the app up.
New users can’t sign up for Hey Calendar directly on the app — Basecamp, which makes Hey, makes users first sign up through a browser. Apple’s App Store rules require most paid services to offer users the ability to pay and sign up through the app, ensuring the company gets up to a 30 percent cut. The controversial rule has a ton of gray areas and...