The argument still breaks down at bigger numbers. If you have 500 different ideas for ways the lord should spend a negligible 1% of his money, then even if you have a good argument that the lord should do something, that's not enough by itself to show that any particular idea meets the bar.
You can't run afoul of antitrust laws without being a monopoly. It's why Apple can make it so safari is the only browser available on the Iphone whereas microsoft lost a bunch of money (particularly in the EU) for installing IE by default on everyone's computer.
Android phones are nowhere near antitrust territory, specifically from google. Before they'd run any risks they'd need to actually outsell someone like samsung or apple.
Just because you are rich and potentially a monopoly in one market, doesn't mean you are in all markets.
On the other hand if you consider the real intention of illuminating Google's cashflow it's pretty damning. Do you pay some relative pittance to keep devices supported, adding value to customers, reducing waste, increasing convenience? 'Cause this is a moral argument, not a financial one, and if you're fleecing the public at large (in myriad ways) it's more a question of the lord giving alms to his subject than it is paying $50 for a piece of gum.
Should Lord Google be a beneficent ruler, or a shitpile?