Can OSV/OSM contribute the same resources to their project as Mapillary is contributing to their own?
Mapillary is VC-backed. OSV is backed by Telenav, a publicly traded location services company. Your call as to which is the more sustainable model!
(The OSM Foundation has no connection with either project and is traditionally focused on its core task of collecting and distributing openly-licensed vector geodata.)
Is it free to use OSV images and data in commercial projects?
Images are openly licensed. Data licence hasn't been published yet but the project creators are making encouraging noises (e.g. in the comments thread of the linked post).