Protecting against 2nd and 3rd party tracking was never the goal. "Incognito"/"Private Browsing" mode on browsers was a feature to protect against leaving local

Protecting against 2nd and 3rd party tracking was never the goal. "Incognito"/"Private Browsing" mode on browsers was a feature to protect against leaving local browsing records. It's often nicknamed "pr0n mode" for that reasons, by people that didn't want pr0n websites showing up in their browser history.