@tek Now that we’re talking about this: I’m sure online ads deployed in certain ways (at minimum) make websites less accessible for people with severe dyslexia, motor issues, vision problems, and certain cognitive impairments.
Although this gets tricky because only public sector websites are covered by Section 508 of the ADA which mandates they be accessible for people with many types of disabilities. Section 508 does not cover private sector/corporate websites.
@MisuseCase I've heard people strongly insist that public-facing websites count under the ADA. I don't have a legal background to have an opinion on this, though.