Delivery drivers need to know where they can pick up and drop off items. People with disabilities want to know where they can find ramp or elevator access
the first benefit he mentioned was kind of product which they can sell (system for helping delivery drivers reach faster), helping increase accessibility was later. It shows priorities for whole project.
I used to upload photos to Mapillary, but after takeover by FB I deleten my account.Now I still haven't found reliable option to upload street images.