Those people are also far more likely to have their email breached, along with the logins you provided on a silver platter. Also they can't log in to your site

Those people are also far more likely to have their email breached, along with the logins you provided on a silver platter. Also they can't log in to your site when the third party email provider goes down. I understand why you prefer this approach for your site, but can not recommend having such strong third party dependencies. Also, personally, not a fan of losing access because e.g: Google disabled my account. I avoid google and fb login like the plague. (I am slowly looking to migrate off/away)