There are basically 2 ways to look at how Google gets what they want.
The general public usualy isn't exposed because all they do is search and use services.
SEOs, businesses and marketers see a different side of Google because we are trying to kiss their butt and please them.
They're like the big famous rock star and we're like the groupies saying look at me - give me - notice me!
The problem is they have so many people kissing their butts they can be rude and arrogant and mean and even do things to hurt people and we still kiss their butts.
They're not even obligated to tell us why they are mad at us or why they slapped us or kicked us out of the concert.
So they abuse this power.
It's unfortunate they handle things the way they do - but the truth is - they don't need us as much as we need them.
Yet their public persona is DO NO EVIL or whatever it is Larry Page has been preaching about Google.
They get away with it and use their power in an evil way beacuse they can and no one holds them accountable.
A lot of good people get hit in their quest to get rid of spam and purge scammers out of their little paradise.
We put up with vague guidelines and keep trying to please tehm. Even when they do mean stuff to us because they are the only search engine that has a significant amount of free traffic.
There are other ways to get traffic - but like it or not - very few businesses can afford to not get traffic for free from Google because it reperesents such a huge amount of traffic that would otherwise go to competitors.