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Under what privacy does a 'current user' (non-registered/temporary user) fall under?

Do these temporary user fall under 'Everyone Else (default permissions) of the Privacy tab?

I am thinking of creating an OTP-like but just inside bubble wherein these non registered users can log-in temporarily using their email (that should match with the data they are trying to view) and I have set up a workflow to generate a random string of numbers and send it to the Current User’s email.

Would this approach be ‘safe’ in terms of privacy/security?

Let me know your thoughts!