Google doesn't have any monopolies. They dominate search, but their showing in office/productivity applications has been abysmal. No domination there.
Google bought Motorola Mobility, who have been intensely underperforming for the last couple of years. Other manufacturers have been excelling; look at the success Samsung has had, for example. If you really fear Google and their dominance, office productivity apps shouldn't be the center of your fear.
There are competitors to many of the built-in functions already. How many other browsers does Android have? How many other email clients? Heck, even a competitive app store from Amazon. Just because Google does it doesn't mean there's no more room for competition.
Google bought Motorola Mobility, who have been intensely underperforming for the last couple of years. Other manufacturers have been excelling; look at the success Samsung has had, for example. If you really fear Google and their dominance, office productivity apps shouldn't be the center of your fear.