You don't need a fit bit. You can put your cell in your pocket and it counts your steps. That's how I do it. Also, not all drug addicts are poor. Maybe one of the top 10 is Charlie Sheen lol! I was a heroin addict in the 90's and I was never down and out. I maintained a job and middle class lifestyle. The idea that all drug addicts are destitute and on the street is a myth.
Competing against yourself ie: challenging yourself to get to each star in the public challenge. Or recording your own exercising and eating and doing better than you did yesterday or last week. That's the point in challenging yourself. Your doing this to get healthier right? That's what the app is for ultimately.