[Schlagbohrer]

It's worse than that, for partial successes they encourage people to submit the attempt but reserve the right to not pay anything (they may, at their discretion, give a partial reward if they feel like it).

[staticassertion]

That's pretty much how every bounty works... obviously it's going to be at their discretion for an incomplete attempt.

[adgjlsfhk1]

it's unusual to have to sign the NDA for a rejected bounty

[staticassertion]

No it isn't. Confidentiality terms are the norm.