The open redirect on google.com has been known for a while: [1]

Google's official policy regarding open redirectors: "Our take on this is that tooltips are not a reliable security indicator, and can be tampered with in many ways; so, we invest in technologies to detect and alert users about phishing and abuse, but we generally hold that a small number of properly monitored redirectors offers fairly clear benefits and poses very little practical risk." [2]

[1] http://seclists.org/bugtraq/2016/Apr/70

[2] https://sites.google.com/site/bughunteruniversity/nonvuln/op...