But, I'm glad I read this article today. Really glad! ...No reason... Just saying.
...OK, I'll admit it... I didn't know that any of these apps could possibly access anything of mine. I thought this whole 'oauth2' thing was about identity.
In case it is helpful: https://security.google.com/settings/security/permissions This page shows what permissions you've given various "apps". This analogous to per-app permissions on an android phone. You can switch between your various Google accounts and GAFYD accounts on this page.