* You can opt-out entirely on interest-based advertising with google [1]. You can also just delete your cookies/only browse in incognito/etc.
* Advertisers cannot target audiences with less than 100 people (1000 for search ads)[2] so they can only get a 1% chance of identifying "you" (this will go down as the list grows above 100), and even then that is only if you click on an ad for their product which is typically way under 1% as well. So less than 1% of the time, they have a maximum of 1% chance of identifying "you".
* They do not sell your personal information [3]
[1] - https://support.google.com/ads/answer/2662922?hl=en-GB
[2] - https://support.google.com/adwords/answer/2472738?hl=en-GB
[3] - https://privacy.google.com/intl/en-GB/how-ads-work.html
* Even if advertisers can target audiences in groups of at least 100 people, advertisers can run multiple campaigns and make an intersection of the sets of people they find, to still "identify" me.
* Yes, they don't sell personal information directly. This one is correct, and there is no reason to believe otherwise.
You can argue that my points are far-fetched, but in the end I am the one who determines the value of my data, not Google.
And I know it is against the rules to complain about this, but somehow that link got downvoted for mysterious reasons. I think I'm raising a valid point here.
[1] https://news.ycombinator.com/item?id=12899160