It's obvious that Android has enabled and continues to enable an ecosystem of hardware companies to thrive. These companies have tried repeatedly to build their own software, but with NO commercial success. Imagine a world with an Apple like Android, Google owning the software, closed sourced, walled, yada yada ... That's still a possibility if the ludicrous EU actions on Android don't stop. Google makes about 1/10th the revenue and 1/100th the profit off Android as Apple makes off the iOS product lines.
Android's ecosystem gets a LOT more out of Google than Google gets out of Android
EDIT: Samsung, LG, Huawei, ... they're even relevant in phones because of Google. I doubt it's the other way around. Samsung is SO scared of Google cutting it off that it tries repeatedly with alternate OS-es --> everything from Tizen to windows phones. Nothing sticks
Google doesn't need to make money off hardware or software, it's an ad company. Yeah sure they'll just go and remove themselves from mobile ads market because laughable penalties EU apply on them.
If the EU's fines are laughable, I think the status quo will persist. But if Google is beholden to Apple & phone makers who use the very OS it provides & builds, cutting others off and owning the hardware isn't far fetched. Why do you think HTC was acquired?
This is a very innocent view of Google's business practices in this area. Google has a tight hold over most device makers through anti-fragmentation agreements and other contracts if they want GMS and want early access to the non-public AOSP tree, which is a practical necessity to ship cutting-edge Android devices. Aside from hard legal power, Google also projects soft power through their control of the ecosystem and device makers wanting to maintain good relations. As a result, Android-derived innovation in the ecosystem is highly constrained even if AOSP is open source licensed since device makers and manufacturers cannot ship devices with Android-derived operating systems in device categories enumerated by the AFAs unless the devices pass CTS (which prevents most kinds of serious divergence from Android).