Earlier quoted context omitted.
Right, the percentage of Apple's cut isn't the key part of this EU case. Certainly doesn't help that it's the current 30% but it being 15% won't change the fundamental issues being argued - whether Apple is abusing its market power and shutting competitors out of or subjecting them to unfair practices in its iOS ecosystem. E.g. unfairly favoring its own Music app. I think it's a fairly straightforward case similar to…
The main difference with Microsoft is that Apple does not have a monopoly in phones like Microsoft had with PCs. Apple phones make up only 13% of the phone market.
> Courts do not require a literal monopoly before applying rules for single firm conduct; that term is used as shorthand for a firm with significant and durable market power — that is, the long term ability to raise price or exclude competitors. That is how that term is used here: a "monopolist" is a firm with significant and durable market power.
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> Apple phones make up only 13% of the phone market.
iOS has 60% of the market in the US[2].
[1] https://www.ftc.gov/tips-advice/competition-guidance/guide-a...