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

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.

Apple appealed the 500 million euro ($586 million) fine issued by the European Union for violating the EU's Digital Markets Act. The EU announced the fine in April, saying that Apple "breached its anti-steering obligation" with restrictions on the App Store.