Re: Well, well, well, well...
That's like arguing that Mars have a monopoly because they're the only company that sell Mars Bars. You can argue about it all day but you still would be missing the point of what a monopoly is.
The device owners have plenty of choice - their choice is not to buy an Apple Watch and buy one of its many competitors instead.
Restricting what consumers do with your product is not monopolistic. Some restaurants allow you to bring your own wine, others insist you buy a bottle from their cellar, the latter are more restrictive but they are not monopolistic. If you don't like the more restrictive environment, go to one of the others.