Amazon already showed its hand at maliciousness when it blackballed all chromecasts from stores, including 3rd party sellers. I don't put suddenly blackballing netflix beyond amazon's consideration. Amazon is cutthroat with public customers, corporate customers, and with its own employees. I think netflix is stupid to put more eggs in the vulture's nest.
In fact, I can pretty much guarantee that at the first opportunity where the lawyers agree it is a usable hole, they'll try to kill netflix through denying it service. Taking out netflix for a week or two while the engineers rebuild the backends with a different provider would be excellent for amazon's video division.
AWS is a gigantic cash cow for Amazon now. If they were caught with their hands in a competitor's cookie jar the fallout would cost them in the billions. They probably wouldn't risk it, but this is just me hypothesizing.
