G owns G...soooo it can do whatever it wants. If they want to turn the whole front page into adwords they can.
I remember reading they applied for patents to have their servers on barges out in international waters where the flow of the ocean will produce the energy to power it all plus be out of control of government. Plus it would not surprise me if they are considering doing something the co-founder of paypal has planned
here
I hope surfers start using yahoo in protest! I know it won't happen but a man can dream