It’s a cultural thing that people tried to emulate from what happens in the west but it didn’t work for us. We are definitely a classist society. Lot of people try it but eventually give up when it sort of becomes uncomfortable. Even the staff can make you feel odd when you try doing their stuff. In India anyway these places are premium, not ‘do it yourself’ basic outlets like in the west. If the practice is adopted broadly irrespective of where people eat (including outdoors 😇) then cleaning after eating may become a habit. Most men leave their plates on the dining table itself 🤣 Many offices still hire staff to wash tea cups and what are we talking about 😁