

But Apple had stumbled upon a notice in the ProtonMail app that advertised ProtonMail’s paid web app service, which it argued breached Apple’s policies mandating that “the sale of digital goods and services within an app must use In-App Purchase.” Rather than fight, Yen decided to immediately comply.
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For the last 2 years, ProtonMail had offered a premium paid email service through its web app, though it did not offer any of the paid service functionalities in its iPhone app. It warned Yen that his company’s encrypted email service app was in breach of Apple’s rules and that it would have to add “In App Purchases” (IAPs) in order to remain on the App Store. In early 2018, ProtonMail CEO Andy Yen received an ominous email from Apple’s App Store compliance team.
