I'd like people to STOP PRETENDING that the only plausible reason why someone doesn't agree with this is that we don't understand it. Yes, I understand what this does. The browser tracks which advertisements have been visited, the advertiser indicates to the browser when a conversion action happens, and the browser sends this information to a third-party aggregator which uses differential techniques to make it infeasible to deanonymise specific users. Do I get a pass?
Yes, this is actively collaborating with advertising. It is, in the words of Mozilla, useful to advertisers. It involves going down a level from being tracked by remote sites to being tracked by my own browser, running on my own machine. Setting aside the issues of institutional design and the possibility for data leaks, it's still helping people whose business is to convince me to do things against my interest, to do so more effectively.
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.