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The reasoning is that the website breaches the "Americans with Disabilities Act," as it features an "exclusively visual interface."
According to NME, the lawsuit was filed by Mary Conner, whose lawyer wrote that the the plaintiff "dreams of attending a Beyoncé concert," but cannot do so as while browsing beyonce.com she "encountered numerous barriers which limited her accessibility to the goods and service offered on the website."
This may sound strange given that websites are inherently visual - however, the issue comes down to what is called "alt text," which allows software used by the visually impaired to tell the user what is on screen. Alt text contains vital information such as image descriptions, text, and links.
Beyonce.com does not, according to the suit, contain any alt text at all. The website also lacks functions that would allow users to navigate it using their keyboard rather than a mouse or other pointing device.