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by icebraining 4144 days ago
It already is: Mozilla has been building apps¹ that allow users to contribute to a shared database of the locations of cellphone towers and WiFi APs.

The idea is to allow GPS-less devices to find where they are, but it could certainly be used to identify new towers in places which had already been mapped.

EDIT: It seems there's also opencellid.org, which actually allows you to download the full database.

¹ https://location.services.mozilla.com/apps