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

Apple appealed a $580 million fine from the European Commission, which claimed that the company broke the rules controlling how app developers could communicate with users on Monday.

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.”