How did the app made money when it was live ? I've got a similar idea and want to start implementing.
The project was funded by the developers themselves. I asked the same question a while ago, here's there reply :
Folks - all march payouts have been sent ! please check you got the BTC
@apoorvlathey we are funding the bitcoins from our pockets as of now - yes no ads. we have crossed 215million steps walked so far. Any leads for sponsorships would be greatly appreciated
Also ...
...We launched this app as a social exercise...