Password Checkup provided a warning to users if they were using a username and password combination checked against over 4 billion credentials that Google knew to be unsafe. Launched February 5, 2019; shut down August 31, 2020 — it lived 1 year. One of 25 Google products killed in 2020. https://9to5google.com/2020/07/30/password-checkup-chrome-extension/ Data: Killed by Google (killedbygoogle.com, MIT).