If I go to https://groups.google.com https://groups.google.com using my Android phone and Chrome 69 and press the sign out link, it won't sign me out. Next time

If I go to https://groups.google.com https://groups.google.com using my Android phone and Chrome 69 and press the sign out link, it won't sign me out. Next time I go to groups.google.com, I'm still logged in. What is the point showing the sign out link if it doesn't do anything? Thanks Google. Firefox on Android properly signs me out. One more reason why I don't use Android as my primary phone. I just don't trust Google.