In the context of VPNs for example. Some VPNs store and provide information about what sites you go to third parties. Third parties analyze it and figure out what adds to show you. Hmm… then let them show me those adds they want to show me. I do hate adds as a whole and use an add blocker, thus. But I couldn’t care less what particular type of adds they show me, they are still adds.
Someone knows what sites I go, what then. If someone curiously inquired me on this type of information I’d tell them without giving a second thought. Incomparably larger amount of data I put out just by making comments and posts.
This is the difference between you and people who care about their privacy, then. I would happily talk about that to someone I trusted, but not a random person on the street, and certainly not someone whose interests I know don’t align with mine, which is mostly true of every company on Earth. Not to mention that any of these companies could be subpoenaed for this information at any time, which would be an issue if the law changed to make something I do illegal.