If Amazon wants complete control over the interview experience, maybe there's room for a service that rents out small office spaces, like ZipCar or AirBnB, but for a desk/small office with just a Chromebook, for this express purpose.
Amazon or any other company could say they need a desk close to some place on some date, and the service could make one available that meets the requirements (laptop, multiple camera feeds, etc).
Or maybe this already exists?
The "disruptor" here is ProctorU and similar services. They are cheaper, generally more convenient, easier to schedule and manage.
Maybe you can come up with a better "test center" (perhaps a van?) but most people don't care at all about what ProctorU does with their computer.
Most people might not, but I suspect many of the best people for many tech, especially -- but also many other knowledge work jobs -- do care, quite intensely.
I don't know whether I qualify as "best in tech", but: last year I was approached by a large company which uses Django, and which solicited me to apply specifically because they wanted a Django committer on staff. In other words, I was absolutely a known quantity for them.
They still shoved me in their Fizzbuzz phone-screen funnel. Spoiler: for that, among other reasons, I stopped trying to follow up with them.
This does not seem to be an unusual practice for large companies. Even when they're recruiting specific people who they know and initiate the contact with, they still set these awful "prove you're not one of the impostor rabble we say are beating down our doors" hoops for people to jump through.
What does best mean anyway?
And this is why I cringe whenever I hear people talking about "disruption" like it's a good thing.
I once heard someone seriously suggest that higher education should be disrupted by newer education systems that don't have to be accessible to the disabled because universities are "wasting" too much money on accessibility services. See also: AirBNB encouraging landlords to set up unregulated hotels and causing nasty externalities for the whole neighborhood. It seems to me that "disruption" is code for "figure out how to cut corners in a way that makes everybody's life worse to increase your profit margins".