I presume that's the idea. I'm not questioning the idea as much as this particular implementation. :) If I ran the zoo, I would have sent a message to everyone'

I presume that's the idea. I'm not questioning the idea as much as this particular implementation. :) If I ran the zoo, I would have sent a message to everyone's inbox (at least, everyone in areas that Waze Carpool exists!) once, then updated the app to have a "Learn about Carpool" link somewhere that is not the main driving screen.