something akin to 'reward points', but yeah...it's a bit of a grey area! Cadoo.io is doing a similar thing with exercise and they treat it legally as 'loyalty points' but in reality it's prizes. It's one of the big unknowns about the model to be honest - we kind of hope that it will seen more like a community finance initiative or a business cooperative.
Thanks, this was a really helpful link. In the case of HackerStash I'm confident it falls within the definition of a contest, and not sweepstakes or lottery. There are a few areas where this could be tightened up and the article will help with that, but likewise we've met all the criteria set out in the article other than terms relating to 'what happens to prizes if someone dies'. We'll have something added there!
Curious about what you're working on now, feel free to come join HackerStash and share your progress ;) haha