Trading favors is the name of the game. One may argue that lobiying dollars are the favor Google is offering. But one may not realize that dollars are merely the cost of a ticket to participate. It is not the sole price.
There are many examples throughout history that this is the way things work. There are two possibilities. Either Google's and governments relationship works the way Assange has described OR US governments in the last fifteen years are completely different (more honorable?) than all the governments throughout the world before that.
What do you think is more probable?