They could probably enter at the very low end of the market and offer a bunch of free services on the devices: prime, video, music.

That'd probably seed it with enough users to get folks to port apps, which they've made really easy because according to the article their sdk is react native based. They'd just need to keep a toehold for a few years before diversifying demos.

I don't think they're going to though. Computer hardware is too difficult to do as a side business.