As the original Macrumors article emphasises, the CMA ruling applies to both Apple and Google.
Smartphones have become the device of choice for our interaction with the digital world, and as such have evolved from nice-to-have gadgets (remember Steve Jobs original iPhone presentation?) to an everyday, almost-essential commodity ... in fact it's only a matter of time before access to, or ownership of, a mobile/cell phone is deemed to be human right.
There are two dominant ecosystems ... or prisons ... iOS and Android. The prisons have different characteristics, but they are prisons nevertheless. And for a commodity, something that is increasingly an essential part of modern life, Apple and Google cannot put all of us in a prison (either of them).
The content and use of my iPhone (or my Android phone) ... a phone I have paid a lot of money for ... cannot be controlled by just one tech company. That's why more and more governments ... and people! ..., including in the US, are getting fed up with these arrogant tech giants.
It would be quite different if there were dozens of different of options, because, to survive, they would have to offer interoperability. But with just two, they condemn us, the consumer, to lack of choice once we have entered their prison.