I have never seen a use of a Magic Link that wasn't because I asked the Magic Link to be sent to me. Never, ever had one sent to me in a marketing/engagement email.
Google is comparable, but it's too risky for them to have so many magic links hanging around in customer inboxes, because Google identities tend to be tied to far more sensitive 3rd party applications. Which is not to say that there are no sensitive applications with "Login with Facebook", but I'll argue there are fewer.