TFA gets a few things wrong - the analogy to house building is off, and I don't think the moral argument is even necessary - but ultimately if, as I infer, he's

TFA gets a few things wrong - the analogy to house building is off, and I don't think the moral argument is even necessary - but ultimately if, as I infer, he's talking about web professionals, not hobbyists, those people should care and be educated about how to do this. The house analogy bothers me because a house is not a public space the way a shop or museum is. And a lot of accessibility concerns like contrast ratios are simple and can be minor CSS changes - analogous to curb cuts in sidewalks. But if you're acting as architect for a public-facing website for a business then it absolutely makes sense without invoking any moral obligation to engineer at least a minimum amount of accessibility.