[varenc]

The article actually enumerates what else the fee is used for. In Google’s words its:

""" Android & the Google Play Store: The free Android operating system enables hardware manufacturers to build a wide range of devices at different price points that gives users unprecedented choice. And the Google Play Store delivers the world's largest selection of apps and games, available in over 190 countries with personalized recommendations and easy discovery of high-quality apps.

New Android platforms: We build platforms for new form factors such as Auto and TV to help developers increase their reach in new ways.

Security: Consumers trust Android and Google Play because of its security, the reviews of apps to ensure they comply with policies around safety and privacy, and with automated security of Google Play Protect that scans over 100 billion apps per day.

App distribution: Developers can instantly reach over three billion Android users with the ability to optimize delivery by device and functionality and provide ongoing updates.

Developer tools: Developers can run experiments, beta test, optimize store listings, analyze performance, and more. """