Identity services from the large companies are very convenient, but the citizens of Google, or Apple, or Microsoft are largely faceless and rightless citizens of a corporation with no ability to contact anyone for anything.
The story and lesson is simple is to tie as little as possible to identity systems using a domain you don't own.
This isn't a statement of expecting perfection from any group, just the opposite, of knowing that things can happen unexpectedly, where is the middle ground in a relationship that impacts the user more than the company if the ID is lost.
Identity services from the large companies are very convenient, but the citizens of Google, or Apple, or Microsoft are largely faceless and rightless citizens of a corporation with no ability to contact anyone for anything.
The story and lesson is simple is to tie as little as possible to identity systems using a domain you don't own.
This isn't a statement of expecting perfection from any group, just the opposite, of knowing that things can happen unexpectedly, where is the middle ground in a relationship that impacts the user more than the company if the ID is lost.