In the DACH (Germany, Austria, Switzerland) region, there is Routago, a router aimed at visually impaired pedestrians. Though the software itself is proprietary, it uses openstreetmap data for navigation. They started as a university spin-off. Looking at the homepage now, seems they got some funding and features creep, now it talks of wheelchair and more, though Public transport is sorely missing.
The router uses sidewalks (those mapped as attributes) and highway crossings (those mapped as nodes), in order to suggest safe trips. It uses surface information too and can do plaza-navigation over pedestrian areas. Additionally they use the device camera for object recognition; so do not rely on GPS alone, something certainly just as much needed as in autonomous driving.
I am a bit of a fan of their demo system, this short trip form one inn to the other https://www.routago.de/pedestrian-routing/?lang=de&map=47.2517793,11.4034277,18&start=47.2518466,11.4011264&ziel=47.2524948,11.4051282 shows it at its best: Yes, they just cross the street, even though there is no crossing there. The detour would be just too much. As all pedestrians, blind people are sensitive to distance too. I have seen some truly hazardous moves by one of them fairly recently.
PS: The blind can get by with google-maps navigation quite fine. Some might even do so out of desire to state, that they are in no way less capable of roaming. Some may prefer the less chatty instructions. Getting back at the question: Yes, there are users for accessibility.