The author abused his relationship with Google. He treated
his most important customer as a cash cow. He ignores the
fact that many of the advertisers footing the bill will be
just like him - sole traders and small businesses barely
scraping by.
That's unnecessarily harsh. The author of the article had a win-win situation in mind: by endorsing the ads that were being displayed, he would get more money, but they would get more, serious, traffic. Suppose he had a private contract with an advertiser. Then that advertiser would applaud him saying 'please visit companyX: they sell stuff you may very well want to buy from them and they support this site'. There is no reason to suppose the intention was different in this case.It seems you can display Google's ads, but should never comment on them in any way, not even to say 'Gosh, I really like how they so accurately list companyA, companyB and companyC as relevant for my site.' The first rule of using AdSense is, you don't talk about AdSense?