ever notice how the products recommended for your car just happen to be made by the same company that made the car? Ever notice how the manual for your new hiking boots claims they will work best with the leather sealant made by the same company? Ever notice how the helpful recipes found on the packaging of food items happen to have ingredients that all come from the same food company? why would anybody expect anything different?
50 wrongs don't make a right. Consumers have always expected the manufacturers of their products to give them honest advice about how to care for their products and not to use their position as the manufacturer to force you into situations that actually harm your own interests. The fact that most businesses abuse that expectation does not make it any less egregious that Google has followed in their footsteps.
One of the best examples is Transmission oil... The differences between Manufacturer and After market brands is simply patented detergents the manufacturer refuses to license to after market suppliers. The viscosity, temperature expansion characteristics and ware modifiers are all identical, yet they'll void your warranty if you use them. The OEM brands sell from $12 to $50 a quart compared to $5 for an aftermarket, and are clearly a way to further gouge the customer. It's disgusting that these sorts of scams are allowed to continue, but they are, so the best we can do is call attention to them. At least with Google there are alternatives.