> the only argument that could be made in the benefit for Google is that it is possible to install Apps from other sources. That's already a pretty big differe

> the only argument that could be made in the benefit for Google is that it is possible to install Apps from other sources. That's already a pretty big difference by itself, but in addition to that the Play Store is much more permissive about use of third party payment providers. So e.g. Apple can (and does) sell Apple Music subscriptions on Android without a 30% tax. The converse is not possible.