That's not how they advertise it.
https://www.united.com/web/en-US/content...fault.aspx
https://www.united.com/web/en-US/content...fault.aspx
Quote:United is dedicated to providing convenient and comfortable service to all of our customers. The following information is provided to assist customers with a disability in planning a trip with us. Every person with a disability is different, and you are the best judge of the service you require. If we're doing more or less than you need, please communicate your preferred level of assistance to our employees.