Your comparison is moot. Your example is defamation. There's no defamation going on in the case of Apple and IAP mention. Its factual, honest, transparent. Its

Your comparison is moot. Your example is defamation. There's no defamation going on in the case of Apple and IAP mention. Its factual, honest, transparent. Its solely to inform the customer, its in the customer's interest. As for stores being able to decide what products they sell. This isn't just some small store. Its a huge store. They have [arguably] clear rules (a lot of them). And the rule that a customer isn't allowed to mention the "Apple tax" is unfair because it attempts to hide valuable information _about_ the sale _from_ the customer.