If their engineers say this will work better than rebuilding the copper network from the ground up, I'll believe them.
Who said Verizon's engineers think this is a better idea? I'm sure their input was limited to,"Can we do this, instead of that?", not,"Which is the better solution?"
You used the word nothing. A large capital expenditure, a large infrastructure, a questionable business plan, and the EC itself (a barrier which prevents Amazon from operating there) are not nothing, and they are not minor, and they are not irrelevant. While you may find lots of information about revenue per user at Amazon, you probably can't find anything that says they've actually turned a profit - until that is answered in the affirmative, it is by no means "beyond question". There are seventeen complainants represented, and many are much smaller than Amazon.
Google has threatened phone manufacturers over forks of the code. Amazon doesn't use Android to describe Kindle's OS, though it is a fork, because Google won't allow it. Google has consistently favored specific hardware manufacturers with preferential access to the code. If I contribute changes to the code you won't see my code unless it is incorporated in the release version. Those are all issues which are contrary to "open."
Google's behavior is a major reason no one chooses to compete. The complaint according to fairsearch.org's release includes accusations of "anti-competitive strategy", "deceptive conduct to lockout competition", "predatory distribution", and that “Google is using its Android mobile operating system as a ‘Trojan Horse’ to deceive partners, monopolize the mobile marketplace, and control consumer data,” Those are anti-trust issues.
There is nothing stopping competitors from creating their own implementation of Google Play, with accompanying services, and eating Google's lunch. They just haven't chosen to do it.
Nothing except a huge barrier cost of entry, which is a consideration in anti-trust cases. Few companies have the capital (intellectual and monetary) to succeed (make a profit) in such a venture. Most are either competitors or partners with Google. The competitors have no interest in making the Android customer experience better, and the partners have an implicit agreement not to compete. As for a startup, tell potential investors that you plan to beat Google on their playing field, with their ball, and be careful of the scramble as they rush to fund you
A cow with a full udder is very uncomfortable; if you delay milking her, her body will reduce her milk production. Chickens start feeding as soon as the sky brightens before sunrise, if you don't feed them when they are ready, they won't eat as much and their egg production may suffer. You feed pigs before the heat of the day because they eat less when they are hot. The time of day for shoeing a horse has little impact on one's daily food production, so it waits.