There's a baseline ability to control how much information third parties have in the first place - some people keep to themselves, some people tell anybody ever

There's a baseline ability to control how much information third parties have in the first place - some people keep to themselves, some people tell anybody everything about themselves. People who care about it can, for the most part, at least know what other people know about them. In any case gossip is lossy and low-bandwidth, and people understand those limitations when operating on information from that channel. The same cannot be said for, say, comprehensive real-time browser history.