Whenever you click that easy “Sign in With Google” button on a company’s website, you’re granting the app or service access to some of your information.
https://lifehacker.com/how-to-stop-third-party-apps-from-reading-your-email-1829232539
DawsonITE is a blog devoted to Educational Technology. It's compiled by Rafael Scapin, Coordinator of Educational Technology at Dawson College in Montreal (Canada).