Google Adsense squeezes direct advertising

Began to notice a bad trend. Before the crisis, advertising agencies no-no yes threw advertisement on the site. Naturally, not very much, because it is not number 1, or even 10, but some attendance of more than 1000 unique ones was (and is). They did not ask for a lot of money, but nobody offered it below $ 100.

Already for half a year I have been watching how some large advertisers (customers are world-class brands) began to appear in Google Adsense with direct advertising of their websites and products. It seems, and let it be - well, one company, well, it happens ... But time flows and the offer to place a banner began with the traditional “call next month”, “unfortunately your client did not approve your site”, “this PR campaign was planned in six months”. And really, why should they pay $ 300 directly if they, through Adsense, are wearing a hat for $ 10 or $ 20 a month. And it is unreasonable for the customer to show - well, they say, as promised on all pages in a better position.

If one such smart was, then God is with him. So after all, others began to catch up. And even those that are "your site is not approved by the client." And to see such "visits from the rear" is completely offensive.
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Adsense has an AdSense for Content filtering option to block unwanted advertisers. Itching to “punish the greedy”, because for the site-site it will result in a maximum of <50 $ loss (<10%), and the greedy will have to communicate with the customer, and the advertisers of the customer with the boss.

Has a respected society come across such a situation and what does the society think about the response?

thank