It’s absolutely true. It is a documented fact. It was discovered and entered into public record during the DOJ antitrust investigation into Google Chrome.
They call the signal „popularity“ and it is a successor of the Google Toolbar signal.
I'll take a wild guess and assume they are of a German or Polish language background. Wait 'til you encounter a French person who accidentally uses guillemets if you want one even «weirder».
This is why Chrome begs you to login constantly and will do it automatically when you login to Gmail through Chrome. Everything you do in the browser (bookmarks, settings, address bar) is data about you sent to Adsense. No need for cookies when you control the browser and know who is using it.
Edit: also private browsing isn’t exactly private when you’re logged in to the browser.
Chrome sends home the urls you visit together with the page performance data (and probably more). That's how they build Chrome User Experience Report (CrUX) for the most popular sites: https://developer.chrome.com/docs/crux
Why don’t they also capture information you enter into forms on Chrome?
They control the entire browser surface, technically they can know everything, even TLS and E2E encrypted data, that they silently phone home…
If you think this is silly, consider that Microsoft Recall had been observing everything on people’s entire SCREENS and phoning home much of it. That is how a guy was caught recently: https://x.com/t3chfalcon/status/2074134314145489195
The tools in gmail in some sense "read" all your mail in order to classify spam and do things like calendar integration. The extent to which they do other things with the information is .. unclear.
They call the signal „popularity“ and it is a successor of the Google Toolbar signal.
https://www.justice.gov/opa/pr/department-justice-wins-signi...