A number of popular apps available for the iPhone and iPad no longer include links that direct consumers to their websites to purchase content. App makers can offer in-app transactions only if they are willing to pay Apple a 30 percent cut of their revenue for each purchase. On top of its 30 percent fee, Apple restricts the customer information it shares with developers. The requirement is a particularly bitter pill for content providers to swallow, as the reason for the change is likely to be lost on the vast majority of customers.