Fun fact: it’s only illegal to leverage a monopoly in one market to advance another. It’s perfectly legal for Coke to leverage their large but not monopolistic soft drink empire to advance their bottled water entries.
Sure. The whole thing hinges on whether Google has a monopoly on whatever Google Books' market is (hence why I doubted it would stick). But given that some people seem to define "market" broadly enough to conclude that Apple has a monopoly on iPhones...