> using the law as a bludgeon to force people into obeying arbitrary design policies
They're not arbitrary design policies at all. They're standards that exist for a reason. For instance, if you have some text, display it as text, not as an image of text, because a screen reader won't be able to read it.
> The inevitable effect of this kind of legislation is that technology gets worse for everyone, rather than better for a small group.
Actually, complying with accessibility standards makes the web better for everyone. Here's an example. The giant green table on this website used to just be an image[1]. That made the page useless for screen readers, but it also meant that you couldn't copy the data in the table, couldn't resize the text, etc. A common sense change to display this table as text made the page more useful for everyone.
https://www.boston.gov/cityscore