There are a large number of other datasets beyond the big name ones like OSM. There are governments all over the world uploading thousands of layers to thousan

There are a large number of other datasets beyond the big name ones like OSM. There are governments all over the world uploading thousands of layers to thousands of different open data portals. Dozens of satellite operators selling optical and radar data. Commercial vendors selling information about property, mobile phone reception, demographic information. And it's all in different formats uses different vocabularies and was built to different standards. And it is not just about maps but as an input to other systems and models. Knowing the location of a customer, machine or business tells you a lot about it and this kind of data unlocks that. Also, ESRI are quietly putting a lot of effort into data curation and aggregating it in one place. But whatever they build will be slow, buggy, and focused on ESRI and its customers. In fact a lot of government open data providers have been moving their portals to ESRI and access to raw flat files is being lost.