Everyone who think's David's post was about privacy and information security didn't read it very closely. He said at multiple times that the purpose is because

Everyone who think's David's post was about privacy and information security didn't read it very closely. He said at multiple times that the purpose is because he wants to keep out of "personalized bubbles", wants to have a broader view of web content and to avoid sites changing "some state because it knew who I was". It has nothing to do with what will happen to his browsing habit information or with dislike of being tracked.