Do they not have what is essentially a monopoly on the tablet space? I'm not up to date on Android tablet market share, but it seems to me that there isn't so much a market for tablets as there is one for iPads. Everything else is pretty much nonexistent. I might be wrong about that, I guess.
Using percentages to decide monopoly status isn't relevant. There are far greater factors involved, as the DOJ/MS trial established precedent in that respect.
For example, here is criticism from a top Mozilla dev on iOS's closedness,
http://groups.google.com/group/mozilla.dev.planning/browse_f...
> Bonus points if they've alluded to antitrust law.
How can criticism of Apple be related to antitrust law? What monopoly do they have?