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You can even track people by favicon which bypasses incognito mode. Another part is hiding font urls in css with more tracking...

Was incognito mode ever meant to prevent tracking? I thought it was for porn, I mean buying surprise presents on a shared computer.

it's commonly used for checking how sites look when not logged in, without logging out, or logging in as another user temporarily.

You're correct, incognito mode never has been for privacy protection from websites, ISPs, etc.

While this was possible in the past, I believe it got patched and is impossible today.