A:AnswerYes, within the limits of the device itself. Although the cube can control some TV functionality, it can't change channels, so neither can the voice control.
A:AnswerIf your internet connection is good and allows enough data, then you only need to pay the netflix fees and the fees for the movies you watch. Your cost is based on the cost of the content you choose. If you have amazon prime there are lots of free movies to select from, but there are also pay per view selection which will add to your overall cost each month if you choose them.
A:AnswerSort of. Sounds like you’ll really want the remote too, but it can theoretically do some things like play and pause with your voice. I wouldn’t want to have to solely rely on voice control though.
A:AnswerI’m you could in some roundabout fashion, but if you’re using Apple stuff already, it would be another reason to go with an AppleTV over FireTV, which can do that in much simpler fashion.