Sure, but then that's an opportunity waiting to be taken, especially in your beauty product case. Someone found that niche, took it and now that problem is solved, don't need regulation for that.
For the latter, how sure are you that the benefit outweighs the cost here. Given the current state of the law as I understand it, if websites would be classified as "public accomodations", they'd all have to provide accessibility options regardless of size. Moreover, I've taken a look at the WCAG guidelines to educate myself on what providing accessibility would be like. It's not exactly small, and while experienced, large organizations might be able to comply, smaller restaurants might have issues there, especially if they're skimping on the webdev side of things.
If I wanted to abuse this, I could crawl restaurant listings, hit them with a scary templated legal document threatening a lawsuit for compliance to some law they've probably never heard of.
From an outsider viewpoint, I don't really trust American regulation that much to improve the situation, especially looking at the bay area housing situation and the state of your public transport. The former is a precise case of regulation causing issues, and attempts to remove that highlight how hard it is to remove poor regulation.
