Adding a Method to Enable Login via Email Post Factum

Adding a Method to Enable Login via Email Post Factum Google is a wonderful company, but it is easy to imagine that it may become undesirable to be associated with a Google account due to regulations and other actions. Therefore, I believe that the post-factum addition of login via email address is essential.

We should have just learned about the risks of using a system that logs in with an SNS account, which was recently brought to a catastrophic situation by the outrageous actions of a certain tycoon.