I have been wondering this as well. I cannot imagine having this be autoupdated without review from a centralized database is a good idea. This is a process that needs to be frangible and have some friction in it.

In this day and age, GPS mapping tools have major implications for societal function, safety, economics, national security, healthcare, etc. I'm struggling to think of an industry where a sudden absence/subtle changes of named GPS mapping data would not have an effect.

If everyone relied on the same data base which could push changes to the map in the pocket of every resident of a nation that would be the first thing I would think to hack. Probably easier than actually jamming or spoofing GPS/GNSS over a huge area.

There are thousands of small street changes across the country each day. New subdivisions, road expansions, lane changes, new traffic lights. Of course the vast majority should be auto-updated without manual review, what would a person add to the process? The public database is the system of record in the first place.