Now go look at who are making phones on this base: Samsung is the most popular but it doesn't have a monopoly.
Is the EU going to fine ARM next for having a monopoly on mobile CPUs?
Having a monopoly or being in a dominant position is not the problem. If ARM starts a pizza business and requires everyone who wants to buy mobile CPUs to also order pizzas exclusively from them, then this would be an equally-fineable abuse of a dominant market position and the EU would almost certainly step in.
As it stands, ARM doesn’t force others to buy pizzas exclusively from ARM PIZZA PLACE and hence doesn’t abuse its dominant market position in one market (mobile CPUs) to support its position in another market (pizzas).
Google, on the other hand, uses its dominant position in the "licensable mobile operating systems" market to support its position in the "internet search" and "browsers" market together with anticompetitive behaviour forcing its licensees to exclusively use the Google-approved version of Android.
Most phone makers don't because customers prefer the Google services, but that's not Google's fault. They have provided OEMs with options - options they didn't need to give anyone, apparently, given that non-licensable operating systems like iOS aren't being whacked the same way.
The most Google can do is give away their OS as open source and let people do what they want with it. If they then sell a bundle of extra proprietary stuff on top, stuff that customers want, that can't possibly be more problematic than making everything proprietary.
After all, Apple doesn't even let third party devs from the app store take over the default mapping app: map links always open in Apple Maps regardless of user preference. For the longest time they wouldn't even let apps that competed with their own be developed at all. On Android you can replace the dialer and even the home screen.
I do understand why people are defending the EU here: they like its ideology and vision of the future. But trying to claim Android is some sort of market abuse when Apple's own approach apparently isn't just defies basic logic.
a) Android has market share dominances (likely around 75% in Europe in 2018)
b) iOS is not made available for other companies to use
You could make arguments that iOS behaves unfairly to third party developers and end users, and there are some decent arguments to be made there, but none of them are relevant to antitrust law because a) means there is no market dominance to abuse with, and b) means there are no competitors to be abused.
---
You said "Most phone makers don't [skip Google services] because customers prefer the Google services, but that's not Google's fault". I think this gets to the heart of the disconnect between your stated position, and the legal reality here (IANAL though).
If Google's services are supreme because of user choice, then Google should require no legal arm-twisting to push those services onto devices.
Instead, what has happened is that Google has over-reached with its Android services contracts (one example - if you want to use Google services on one Android phone, you can't make a second Android phone that uses your own services), and that is what the EU is tackling here.
- by preventing manufacturers from selling smart mobile devices running on competing operating systems based on the Android open source code;
- by giving financial incentives to manufacturers and mobile network operators on condition that they exclusively pre-install Google Search on their devices.
They're using a dominant position in one market to push services in an unrelated market. That's anti-trust 101. And they punish suppliers who don't tow the line.
This is exactly the same as the MS anti-trust case. Swap IE for Google Web Services (Search/Maps/Chrome) and swap Android for Windows.
If ARM started forcing phone companies using their CPUs to only sell to AT&T, that's your analogy. As it is, because ARM don't force unrelated services or products on their customers, it's not analogous.
Note that for the purposes of this ruling, the relevant dominant position isn't in Android, but the Google Play Store.
Have ARM used their dominant position in one market to reduce competition in a different market?
Maybe? Is there something about their business practices that shapes the market to their benefit? If so, and there are enough complaints then maybe not "next" but yeah.
ARM do not sell any CPUs. the CPUs in mobile phones come from Qualcomm, Samsung, Apple, etc.