I think there’s an obvious risk here.
TL:DR: I think Overture is an explicit move by corporations to displace OSM by appropriating its value and adding it to a platform under their control, gutting the copyleft license, using OSM as a base layer mixed with unshared proprietary enhancements, and eventually return mapping to being an endeavour dominated by commercial interests in which most people must pay to participate. The only way to prevent this is by vigorously defending and enforcing the copyleft provisions of the ODbL license on OSM data.
There’s a risk if we want OSM to be widely used and be the default basemap for most applications. This is what I want, though I’m aware that not everyone agrees; some people are happy for OSM to be a niche project by and for enthusiasts, which is perfectly OK but not how I feel.
The ODbL’s copyleft provisions have been, I think, instrumental in ensuring that OSM is not buried by proprietary maps. If OSM data can be admixed with proprietary data, OSM will always be literally the least complete map database available. Every corporate map will contain the OSM data plus the proprietary stuff, making every corporate map OSM+whatever; OSM will be the only one that’s only OSM data. With copyleft, corporates can’t do that; they are forced to either go it entirely alone (Google) or at least make a token gesture toward sharing back with OSM (Apple, Mapbox, TomTom, etc). OSM is more complete and useful than Google Maps in many places, and the corporates that use OSM directly, such as Apple, don’t have anything in their map that OSM doesn’t (they add and/or correct data all the time, but they share it back into OSM).
I firmly believe that Overture intends to break this model.
Overture’s corporate members have openly announced their intention to blend open and proprietary data, mixing the two but keeping the proprietary data to themselves. “TomTom’s Maps Platform will leverage the combination of the Overture base map, a broad range of other data, and TomTom’s proprietary data in a continuously integrated and quality-controlled product…"
They also intend to use OSM data, saying “This will include channeling data from long-established projects such as OpenStreetMap…”
They’re telling us what they’re going to do. They’re going to pull OSM data into another “open” ecosystem, strip it of copyleft, and make it a base layer that every corporation can use, add to, and not contribute back to. If they manage this, every single one of them will have all of the data that OSM contributors have created, plus their own proprietary data.
It will be very difficult to persuade people to use OSM when TomTom and Microsoft have literally everything OSM does, plus more.
Initially, I’m very confident that the corporates will provide their offerings at no cost to most users; they know that they can’t compete with OSM if they’re charging a fee while OSM isn’t—at least, not as long as their data isn’t much better and OSM is still alive and well-known—but they’re patient. They can wait until their proprietary datasets accumulate an edge in quality and completeness over OSM (remember, in this scenario any improvements to OSM are also added to their maps, but not vice versa), and until OSM slips out of the public eye and ceases to be an obvious alternative. Then they’ll jack up the price.
And OSM will die, or become a small niche project by and for a handful of enthusiasts in wealthy countries.
It doesn’t have to go that way. The ODbL license is, in theory, sticky. Overture can’t just take the OSM data and add it to a new repository with a non-copyleft license as long as the OSM community effectively defends and enforces the copyleft on the data.
So yeah, maybe cue up the lawyers.