How is that a scam? You don't get participation awards for solving half of a puzzle...

Well, that depends on how you set up the bounty program. What if I find a solution, share it to a friend so that both of us can claim the prize?

that's not the point even. They are attempting to build credibility in two ways: 1. this model is SO advanced that there are huge risks, never before considered. 2. we're doing the super-responsible thing in incentivizing work that addresses this. #1 is unproven and frankly, unlikely, which makes #2 meaningless. The fact that the "prize" is so low & structured this was suggests that they're not that concerned but do think it's likely that a bunch of people will find things. If they truly thought their model was so good they would be confident issues would be both rare and very critical, then offer huge rewards with no limits because they'd be much more confident no one would claim it.