Apple was not directly named, but there was little doubt who Margrethe Vestager was referencing when she described such warnings as “unwise”... Core Technology Fee Any developer wanting to opt out of the App Store, and sell its apps through either an alternative app store or its own website, has to pay Apple a “Core Technology Fee” (CTF) of 50 Euro cents per install per year. The fee only applies once an app exceeds a million installs, but fears have been expressed that this would make