Now why would anyone want to peg phone number or account number to Matrix ID?
You best make a separate ID for mapping your users to Matrix. And don’t show it to the user nor use it for anything else, also stay unfederated.
You best make a separate ID for mapping your users to Matrix. And don’t show it to the user nor use it for anything else, also stay unfederated.
Say you're running Matrix for any kind of official or business purpose. You still want privacy, security, and ownership of your data. But you also actively DON'T want anonymity, instead you want publicly-verifiable user identities, linked to public information like company email addresses and company phone numbers.