That is very true.
Once the American with Disabilities Act was made law, I was told of some deaf people travelling across the country and deliberately staying in small Mom & Pop motels that were less likely to be informed of the law.. then suing them.
ADA required that hotels provide typewriter-like devices that enable deaf people to communicate on the phone, known as the TDD. I think it's moot nowadays since deaf people are far more likely to use their two-way pagers. In fact, my TDD is covered in dust.. haven't used it for 2 or 3 years!