Chapman - 5:39 pm on Apr 5, 2013 (gmt 0)
There is no doubt that the AdSense "open loop" terms and conditions were much easier to accept 8-10 years ago. AdSense was brand shiny new then, relatively simplistic in its design, it worked as we expected it to and, more importantly... it worked the way we wanted it to.
Here now in 2013, as netmeg said in an earlier post, "The entire system is a lot more complicated than it used to be". It's a lot more complicated now primarily due to the ever increasing addition of sites that serve little purpose other than to display ads and/or abuse/scam the program.
Allowing "fringe" sites, after the intial introduction, vastly enlarged the Google advertising network overall but also mandated an enhanced marshaling system. That marshaling procedure we typically refer to as the "algorithm" which is an imperfect, ever growing cyber life form that feeds on not much more than data and statistics. If you have a niche that has similar statistics to the sites it's trying to marshal... you get marshaled too.
The AdSense to publisher relationship is an anomaly, almost completely without precedence and defying traditional business definition. That's exactly what Google intended when it created it and that's precisely what all of us signed up to be a part of.