decentralization has been misunderstood in blockchain, it is not a place to manage anything central and make it possible in a decentralized way.
The blockchain has succeeded in financial transactions because it is data that does not require big space and checking it requires money.
Miners charge fees to verify each transaction. not 100% decentralized and anonymously.
Maps will be decentralized if the servers delete all logs and it will not be free. Will the authorities allow that?