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> Users are always identified to you by email address, phone number or both...

An account system using phone numbers may have a negative impact to privacy. For some people a phone number is attached to a real name and address. Also it is not uncommon for a person to change their phone number from time to time.



For many people (most?) this is true for an email address as well


Certainly for the less tech savvy and thus those less aware of why that might be an issue.




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