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From May 2018 in the EU the maximum fine for a data breach is €20m or 4% of global annual revenue. This is due to the GDPR.[0]

So after a certain point, the bigger the company the lower the fine? 20 million is 0.01% of Apple's turnover.

4% or 20 million, whichever is greater.

Whichever is greater, Apple would probably pay about 20 million * 400 (going by 0.01%) => 8 billion dollars.

Which I think would hit Apple rather hard.