Are there some similar Apps like Burningman out there?
Bitwalking which I have never heard from them ever since I applied.
The idea is to run the app while GPS is active or at least need internet connection during the walk and they will take the computing power of your smart phone little by little it adds up to be a huge hash power when thousands of people install and run the app while has nothing to do with you walking.
The hashrate of your mobile phone wouldn't be enough to make even a little BTC. Also your battery would die soon if you start hashing on the phone.