據說是蘋果官方說法:https://goo.gl/PTyFsy
Thank you for your email and being a customer of Apple products and the App
Store.
We care deeply about bringing great games to all of our users on the App
Store. We would love for Valve’s games and services to be on iOS and AppleTV.
Unfortunately, the review team found that Valve’s Steam iOS app, as
currently submitted, violates a number of guidelines around user generated
content, in-app purchases, content codes, etc. We’ve discussed these issues
with Valve and will continue to work with them to help bring the Steam
experience to iOS and AppleTV in a way that complies with the store’s
guidelines.
We put great effort into creating an App Store that provides the very best
experience for everyone. We have clear guidelines that all developers must
follow in order to ensure the App Store is a safe place for all users and a
fair opportunity for all developers.
Sincerely,
Phil