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Why would you use them? Social logins tie you to a 3rd party, which adds risk to any product and takes data ownership away from you, so I'd avoid them for an app unless the customer base demanded it.

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Thanks for your response! It increases signup conversion rate, should decrease fake accounts, reduce password fatigue for the users. Data ownership is not really affected for most apps as devs can still get and store the user data from Google Auth etc.

Despite all that, some apps still refuse to add Social logins, so I'm wondering if there a less well-known reason for that.

You are talking about data access, not data ownership. Google owns that user data, users need to change their data and manage their accounts via Google. Your customer service team cannot help anyone recover their account, etc. And if Google shuts down your access to their service, your auth mechanism is gone and nobody can log in.

I agree with you but this is likely just the opinion of us techies. Not sure if it generalizes to most people.

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