Spotify announced in a blog written by CEO Daniel Ek that it has filed an unfair competition complaint against Apple with the European Commission (EC). The streaming company is claiming that Apple’s App Store stifles competition by “acting as both a player and referee to deliberately disadvantage other app developers.”

By way of illustration, it said that Apple forces Spotify and other services to “pay a 30 percent tax on purchases made through Apple’s payment system.” That in turn forces Spotify to artificially inflate the price of its Premiere membership “well above the price of Apple Music.” In other words, by acting as a gatekeeper to apps like Spotify, while also offering a competing app, it’s competing unfairly, Spotify said.