>Such information can be used to identify me

Good. We can make things more efficient.

>used against me

How could someone for example knowing you like Elixer use that knowledge against you? It's not a big deal.

k, so how about if instead of "Elixer" it was specific religious topics? Or other things that have legal measures for/against them in various parts of the world.

Such data can be combined with other bits of information to uniquely identify me on the web. And there may be other facts about me and my online activity that I don't want third parties to associate with my identity.