Norway, Sweden and Finland agree - by making its music playable only on Apple devices, the iTunes Music Store runs afoul of their consumer protection statutes.
Apple's leveraging its market dominance in the portable player market to gain share in the online music sales market. This sort of thing is generally considered anti-competitive. Though, of course, people who love unrestrained markets generally find nothing wrong with such behavior.
People in the latter group are more likely to cite Ayn Rand as a major source of inspiration in their lives.