A bidbotted post that refuses payouts, that's cool I like it. Perhaps next time send the money as 100% beneficiaries to steem.dao or null.
I like the idea but I am mostly worried about cheating, If there are tangible rewards people will go to great length to cheat the walking and beat regular users. Si would particularly put an emphasis on cheating, look at pokemon go for reference with people doing stuff in bikes to hatch eggs faster etc.
Curious to see which brands you are partenered with though.
RE: Walky app: Tell us what you think and get SBI shares!