https://arstechnica.com/gadgets/2020/06/why-one-email-app-went-to-war-with-apple-and-why-neither-one-is-right/

Basecamp CTO David Heinemeier Hansson launched a firestorm of public criticism of Apple after Apple rejected an update to Basecamp's new email app. Hansson's tweet thread and the ensuing controversy surfaced days before Apple's annual developer conference, and amidst news that the European Commission has opened an antitrust probe of Apple and the App Store.