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As part of complying with the EU’s mandate that it open up the iPhone to third-party app stores, Apple established a Core Technology Fee that would be levied on developers for the use of its services. Some developers would not have to pay at all, but others would see fees of half a Euro per install, after a certain threshold, and Apple released an online calculator to help companies work out those fees.
Apple had already announced that the Core Technology Fee would not apply to education and government bodies. It also said that developers would not have to pay the Core Technology Fee until such time as they exceeded one million first-installs of an app in a year.