> This will set a dangerous precedent and cost businesses a lot of money and adding zero value to most existing paying customers.

Unluckily for you, we as a society decided that we will accommodate those with disabilities rather than just look at their business value. If we only made choices based on utility, we'd already be implementing widespread eugenics and killing off anyone who gets sick or old. And it wasn't a case of not using the right accessibility tags, check out the quote in another comment, his software couldn't read any text. [0]

[0]: https://news.ycombinator.com/item?id=14579029