Obvious solution - roll your own.
Remind advertisers of the way they used to do things. They didn't profile readers, they profiled pages and doing that was a no-brainer: you wanted to advertise, say gardening products, you bought space on the gardening pages.
Remind them as well that the user "targetting" they're spending money on is very often wasted from the advertiser's PoV by repeatedly showing ads to people who already bought that type of product weeks or months ago.
Remind them that Google sells advertising. Nothing else, advertising. It doesn't sell their goods or services except possibly as a by-product. It just sells advertising and it sells it to them, not their customers.