It's something new, something for True Believers (TM) to get 'excited' about.
I can't see it becoming popular, TBH.
Where I live, there are JWs in the town centre, idly standing by carts. The carts ask people if they want a free Bible course, and direct them to JW,org. When people go on the website, it tells them to ask JWs for a study.
I think this is the way things will go, the street witnessing crap.