They seem quite happy to use OSM data. We'll see how this stacks up w/r/t license: from here (and obviously IANAL), it looks very much like "sure, give us all the ODbL data you have, but we're doing a magic trick here, and the end result is not ODbL, hee hee". https://docs.overturemaps.org/release-notes/data-attribution...

That page seems to save that almost all of the data except places IS OdBL and requires attributing OpenStreetMap?

OSM POI data is definitely severely lacking a lot of regions -- so it makes sense why they'd source that from somewhere else. It's also pretty cool that meta and microsoft's POI data is now open -- from look at it, it has the opposite problem of OSM: there are a lot of businesses in it that don't exist anymore or whose info isn't totally accurate -- but it's very usable for certain use cases (and, funnily enough, could certainly form the starting point for a clean up effort -- that COULD then be stuck in OSM and licensed under OdBL).

These are for-profit companies. Using OSM might not be an option for various reasons (both legitimate and purely greed-driven)