[1]Microsoft took on the bulk of the financial and research hurdles in bringing Pebble support to Windows Phone, but the Pebble CEO said more or less "fuck you, I hate Microsoft because reasons" and shuttered the deal: http://www.windowscentral.com/pebble-microsoft-and-what-coul...
...and in an hypothetical lawsuit this will just turn in favor of Apple.
Without having done any kind of structured data gathering and analysis, my intuitive impression is that it is not all that unlikely that a finding of market power for Apple in the smartphone market could be supported, and that therefore anticompetitive leveraging of its position in that market to build a stronger market position in the smart watch market could be an antitrust violation.
One of the other comments here argues for it being "the market for iOS apps", which is far narrower, and seems way too narrow to me. If Apple built the device, and the OS, and the marketplace, of course they're going to have a monopoly there. Just like Walmart has a monopoly on things sold at Walmart.
A definition of the market that seems sensible to me would be the "mobile device apps" market. There, Apple is one of two players with any significant market share. It's not a monopoly, but it's probably enough "market power", in the antitrust sense, to draw scrutiny from regulators.
No, not just like it. Walmart does not exclusively sell goods that require a Walmart product to use. That distinction makes the comparison not very similar at all.
If you have set yourself up as the sole gatekeeper for selling apps in your walled garden, you accept legal responsibility in that role to maintain a level playing field. If you don't like it, don't put up the walls and compete at being the best flower in open parkland.
I'm not sure that this is as innocent as it might sound. Walmart exercises plenty of market power, unethically if not illegally, to make sure that it has a monopoly on some of the things it sells. (By way of comparison, would you expect that, say, Target of course has a monopoly on things sold there? Maybe you would, and I've misunderstood your language.)
I'm not a lawyer, but isn't that roughly compatible to the Microsoft/Netscape situation?