What part of, all monopolies are not legal, did you not understand?
You don't seem to understand the complete lack of a meaningful relationship between the concepts of monopoly and legality. The way you insist on using the terms is completely irrelevant to antitrust law.
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Apple neither had full control of Music or Music service at that time. There has always been other means to purchase digital music other than iTunes/iPod.
Apple just had a better mouse trap so they had a bigger market share. NOT illegal.
Now if the plaintiffs can prove Apple used their market share to force the Music industry to only sell to them. THEN that would be illegal.
And this response proves my point. Full control of a market has no bearing on whether a company has or could violate antitrust laws. It simply is not a criterion.