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What if there were a service where anyone can opt in to share their own location information? If there was a way to get across the hurdle of how does the service provider know if the person is indeed who they claim to be…

My thought is something like a phone number, email address, or domain name bypasses this problem. It is fairly trivial to verify you have access to a phone number, email address, domain name. Feels like this is one of those chicken and egg problems though. Why would anyone list their location at my service if nobody queries it and why would anyone query my service if nobody lists their information with me?