Funny detail: their maps are more accurate than official ones on many aspects; when I asked at a conference if they’d consider giving back to the community and authorities, they’d say it wasn’t worth it, they wouldn’t take it. When pressed (fairly certain OSM would welcome and had detailed APIs for it), they confessed not trying, because it wasn't in their commercial interest.
The impact of their work appears to heighten urban issues: segregation and white flight, gentrification and pricing out incumbents… But then again: that’s the obvious consequence for more information. I doubt the solution to those issue is by regulating those services.
Local volunteers for OSM are aware of the free riders and would consider negotiating giving back, but they don’t thing it's worth their non-existant legal ressources. Government officials appear intellectually unaware that this could happen.
On the other side of town we have an Open Data Institute - and these (again centrally funded) run a number of corporate level training days around open data. The idea is to make a little ecosystem around it.
Admittedly it's not quite the same vein as most Open Data, as the majority of Open Data implies it coming from closed sources.
I'd also include other geospatial companies who provide visualisation and analyses tools which are using other things apart from OSM.
Edit: typo.