The local Redbox machines here seem to do steady business. I see people using them almost every time I get groceries.
Rural people who can't get internet at home likely can't get good cell service at home either. You only have to be a few miles off of the main roads before service degrades rapidly.
Also, the unbanked. People who have money but bad or no credit.
But all that said, while it might still be possible to make some money with DVD rental vending in 2024, but it's not a growth business at all.