I a little disagree with opinions
from this thread about Google.
Yes, the big percentage of Google revenue related to Adsense, but not only Google relay on this. There are millions sites that getting profits from this program. For some of them Adsense is the only source for making money. If your site offering free services the easiest way to get something from it - is Adsense. So Google protecting not just yourself but also other people.
In theory the Adsense is a good system and benefits both advertisers and publishers. I personally using it as an advertisers and publishers. It is not a Google who start making the problems, it is
click fraud and people who is abusing the system.
Yes, sometimes there are some mistakes when Google block publishers, but in most cases they block real abusers. I believe that these mistakes could be fixed.