I mean, come on, you are in the tech hub of India and very likely most of the shops you go to are located in richer areas or areas with a higher number of tech

I mean, come on, you are in the tech hub of India and very likely most of the shops you go to are located in richer areas or areas with a higher number of tech people. I don't know about how popular UPI is in India but your anecdote doesn't really say how it is like in the rest of India.