You can safely ignore that "audience" since they comprise 0.01% of a niche. They are vocal in sites like HN and Reddit and so on but the numbers are safely ignorable from a market standpoint.

If you want to spend your development effort in something worthy that will increase your audience, your should instead make sure your sites are available to people with disabilities. They are a far bigger share of the market (any market) and you will feel better by supporting them.