"In that way and depending on how your personal data is manipulated, Facebook Login could almost fall under the category of a dark pattern - a method for websites or apps to get you to give up more information than is required by playing on assumptions.
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But it's fair to say that Facebook should be less trusted today than it was nine years ago.
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Just like we should all be doing our part to detangle our lives from Facebook's web, app developers owe it to users to divest in their reliance on Facebook Login.
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It's one thing to offer Facebook Login as an alternative way to easily create an account, but to straight up not offer any other way to log in to an app or game is just lazy on the developers part, and speaks to the way Facebook has lulled us all into complacency."
Source:
https://www.androidcentral.com/its-time-app-developers-fall-...