what do I think the history is? A record of the sites I visited.
What do I think the history isn’t? A correlated record of which advertisements I’ve been exposed to, and which conversions I’ve made, that gets sent to people who are not me.
Pretty relevant distinction. One thing is me tracking myself, another thing is this tracking being sent to others, no matter how purportedly trustworthy.
So it would still help optimising persuasion at scale (also known as lying to people to best et them to act against their interest). Why is this a good thing again?