I feel like this is already partially the case with OSM. Many cities offer online GIS services where you can download lots of data using a GIS program (MassGIS

I feel like this is already partially the case with OSM. Many cities offer online GIS services where you can download lots of data using a GIS program (MassGIS for example). Openstreetmaps allows anyone to make their own mapping app without worrying about where to source the data. The main barrier is getting contributors to add data to OSM. Some cities like Boston / Somerville seem to have hired office staff to improve OSM, as I see a lot of edits from usernames relating to the city in those areas. Another barrier is that the GIS system can be hard to work with, a lot of the programs being expensive and comercial. I managed to compile QGIS from the AUR but got confused by the thousands of coordinate systems and the exporting process, so my hometown will have to go without subdivision labels until someone more experienced can add them. I'm really hoping that more people can make maps apps using OSM data, since OSM is often up to date enough for my needs in the areas I am in, but the best app I've seen so far (Maps.me) has a kinda old interface as well as map rendering that feels too cluttered to me compared to google maps (details shown at various zoom levels).