Google won't do this IMO because that's all user data. A user submitted the pairing between the key and the value. If they released an entire database of user d

Google won't do this IMO because that's all user data. A user submitted the pairing between the key and the value. If they released an entire database of user data they would run afoul of data privacy regulations. They could possibly provide a GCP service where you make an authenticated request to look up the value of a given goo.gl key. That would mitigate fishing concerns, eliminate the pressure of running a productionized legacy service, and allow the to do use quotas etc to tamp down on abuse. But that also would be covered by the regulatory laws and I don't know what they say about such a thing.