First time they're out of compliance, the fine is 10% of their global annual revenue. Then 5% of their daily average revenue until they comply.

Second time they're out of compliance, the fine doubles.

If they still breach compliance, they get investigated for systematic non-compliance. The Commission can then impose structural and behavioral changes.

Or Apple can stop providing service in the EU. But they're not going to say goodbye to a fourth of their global revenue. They will comply.