P3P died when Google started intentionally breaking it.

P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&a... for more info."

https://tech.slashdot.org/story/12/02/20/2127250/microsoft-a...

https://web.archive.org/web/20120220235443/http://blogs.msdn...