There is no harm in doing what MS is doing. Making it harder for competition to buy out strategic assets or non assets

is part of the game.
About adsense, google had been running an inbuilt system before the buyout. Infact many engineers have claimed so also
Toogle Many Googlers: Another Googler takes credit for AdSense
The thing is that google made it a success and partly the strong search backend and the data that google already had made that possible.