Any time a company starts to try to compete with their own vendors, things get awkward really quickly.
When Amazon was selling other people's products, there were no problems. Now they have their own, and any time they push those in favor of a competing option that they used to sell without any qualms they're going to be in trouble.
Apple has this same problem, but it's mostly limited to accessories. If they stopped selling Belkin and Beats and LaCie in their stores, we'd hear a similar clamor and people would be justified in being pissed off.
By that logic, one could I think make an argument that Apple are being jerks by not carrying Logitech products in their physical or online stores. Considering Logitech (no affiliation) has without exception made the best mice for OS X for over 15 years, Apple offering their overdesigned and underdelivered 'mice' and excluding Logitech is a protectionist move.
I don't disagree that Amazon has antitrust issues, but this simply isn't an example of it. Amazon is arguably trying to ensure competition (in this case, their competing platform) survives against an illegal anticompetitive action.
The exact terms that Google uses to block Amazon devices from using Chromecast and other Google Apps is the same one they're expected to face a new recordbreaking fine for in the EU (larger than the last one) by the end the year.
I mean, I guess I could be sold on the statement that it's two behemoths throwing around their leverage to try and force each other to play ball.
