see the OSM forum at Starting the OpenStreetView.io project / General chat / OpenStreetMap Forum
first example pictures are quite impressive, IMHO.
The only issue I see is that this requires a 3D cam, that not everybody is willing to buy/carry/use as opposed to a cellphone or mounted cam in a vehicle. But you guys should maybe get in touch.
I guess there is no legal problem for him to upload mapillary pictures into his system, and mapillary can upload his pictures to mapillary.