> No, I'm claiming that under the circustances that you (or the OP) described in the previous comment it wouldn't lead to an antitrust violation.

The OP was claiming that the reason Sun was not prosecuted for an antitrust violation despite the lack of OS competition for SPARC hardware was that other hardware existed in competition with SPARC. But the reason there was no competing OS to run on SPARC is not the same reason that there is no competing OS to run on iPhone. In the case of SPARC the lack of OS competition was not a result of any interference on the part of Sun. When Linux was subsequently ported to SPARC they made no effort to prevent it, I imagine they probably did most of the work. In the case of iPhone the lack of OS and app store competition is directly a result of Apple thwarting it. It is extremely likely that at least one of Android/Ubuntu/FirefoxOS/etc. would be ported to iPhone hardware in the alternative, and that Amazon or others would be operating competing app stores. So the existence of hardware competition was not the only thing saving Sun from an antitrust violation -- even if they had a strong hardware monopoly their behavior wouldn't have been an abuse of it. Apple is behaving differently. Its behavior is distinguishable from that of Sun in a way that makes an antitrust violation significantly more plausible. There is a much stronger argument that Apple exerts monopoly power over the market for iOS applications than Sun ever did over the market for Solaris applications. Which part of this do you deny?

> Well, the low allows it and companies have been doing it for ages, e.g with game consoles.

I'm not sure how clear that is. Was there an antitrust case against a game console maker in which they were vindicated? Just because the government has never prosecuted anyone doesn't mean it isn't a violation. Antitrust law is about as clear as mud and they rarely prosecute anybody even in cases of much less nuanced violations.