[I am not a founder] Social media login is a dependency. When social media login breaks, users contact the app maker for support not the social media company.

[I am not a founder] Social media login is a dependency. When social media login breaks, users contact the app maker for support not the social media company. An app maker doesn't have control over the timing or reasons that social media login might break. Those reasons can range from a user having their account banned to the platform deprecating an API. Basically, another company has control of your app's availability and access. Your users may not be able to recover their accounts. And you take the loss of goodwill.