Link-out fees collected from developers are a bargaining chip as Apple fights against the Digital Markets Act.

Apple Inc. appealed a €500 million ($580 million) fine from the European Union, calling the penalty “unprecedented” and the regulator’s required changes to its App Store as “unlawful.”

Today we filed our appeal because we believe the European Commission’s decision, and their unprecedented fine, go far beyond what the law requires. As our appeal will show, the EC is mandating how we run our store and forcing business terms which are confusing for developers and bad for users.