He doesn’t even want these things. May I try on your sunglasses? Can I have a taste of your ice cream?
I guess they set the bar low to encourage the experimenters. “Don’t worry you can ask for anything — ask for a dollar! Borrow their newspaper!”
I would be more open to it if they had done some thinking. What’s something you genuinely need? Go ask for it. But I guess that’s not as simple. This is just street side IRL spam. Can I have those plastic flowers that I don’t want by which I mean can I waste your time with a nonsense game so I fresh content for my blog?
It’s also fundamentally selfish: “ask random strangers to do you favors”
Why not go out into the world and ask if you can do favors? Find a homeless guy or gal. Ask if he wants your shoes. Ask if she needs a dollar. Then you at least anticipate finding people who welcome partition in your psychological experiment.