That would be stupid for most sites - only a small minority of customers are blind and it isn't worth changing the entire site for them (unless you are amazon or you get it for free by using standard HTML things like links, buttons, etc).

And before you scream ADA, that is a) nationalistic (not all web developers are in the US) b) usually something that can be worked around - e.g. put your phone number on the site as an alternative.