I am not at all surprised to see this. There are two carts at this location in Westminster, London. I have passed this location dozens of times and there are always crowds of people around, mainly tourists there to see the Houses of Parliament, Big Ben, Westminster Bridge, The London Eye etc. I've never seen anyone speak to these people. They see hundreds of people an hour yet no one talks to them the whole day and they are not allowed to proactively engage.
It must be the most boring work, looking at your phone is the only distraction you get.