I think Google might mean that the community wasn't actually taking advantage of the feature to provide very many subtitles (i.e. low supply); not that there weren't many people using such subtitles when available.

It's not quite like removing a ramp. It's more like a city had a program of "we'll help pave and maintain the sidewalk in front of your business to be more accessible, and to add ramps to connect to your door, by request"; but then no businesses took them up on that offer by requesting ramp installation—so they stopped offering the program.