My opinion (probably an unpopular one) is that tracking for advertising is merely the excuse to justify widespread surveillance. I don't think all the advertising revenue that is purported to be in play stacks up. I personally do not think advertising directs my purchasing. I don't think it directs others either.

I get that this is Google's business, but perhaps a large amount of their 'business' is actually from the government system (directly or indirectly) - they merely have to pretend to be running an advertising business.

I'm saying that the whole point of advertising was surveillance from the beginning.