they didn't prohibit charging more for App Store purchases, they prohibited mentioning it in the app. i.e, you cannot mention something like 'purchase this in-app product for $3 cheaper on our website'.
To be more specific, previously they prohibited telling about any other ways to buy elsewhere:
"Apps and their metadata may not include buttons, external links, or other calls to action that direct customers to purchasing mechanisms other thanuse in-app purchase, except as set forth ...",
And that includes sending promotional emails if said emails were gathered via app.
Andrew_nenakhov|1 year ago
"Apps and their metadata may not include buttons, external links, or other calls to action that direct customers to purchasing mechanisms other thanuse in-app purchase, except as set forth ...",
And that includes sending promotional emails if said emails were gathered via app.