What is a plausible economic explanation as to why Braille ""dots"" are commonly found on drive-up automatic teller machines although blind customers likely will not use a drive-up automatic teller machine?

The economic explanation that can be given is that the marginal cost of making two different types of keypads is substantial and the benefits of providing keypads without the braille dots are mere very difficult to the ATM users

Explanation:

When the machines were first developed it was the association that argued that there must be drive up automated machines for the blind people and hence they were designed as such

When the driver drives the car they can make the people to the ATM and then they can make the way through the machine and make the transactions needed