Is coffee in Diners free after the first one?(both)

All American shows I watch where people eat in Diners, they have a black coffee and the waitress comes back time and again to top up the coffee if the guests wants more.
Do you only pay for one coffee then it is a bottomless cup?

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DeWayfarer · 61-69, M

Depends on where. Fast food places no longer give free refills. Mostly because it's unfair to drive through customs.

Gusman · 61-69, M

@DeWayfarer I do not understand - Mostly because it's unfair to drive through customs.
Drive through customers?

DeWayfarer · 61-69, M

@Gusman fast food places like McDonald's and such, there are nearly a hundred here, their main customer base is drive through and you have to wait in line no matter what. They can't do self serve, so it's a bit unfair to them. The wait is quite long actually. Up to 20 minutes during lunch. It's a single line of cars. Not like multiple cash registers on the inside.