The idea is to tap into bounty hunters to review code and receive money per bug found. Orgs might not be happy to put their code out there, but most code is relatively trivial (e.g. a dialog which has some actions when doing things), and without context you don’t know how or where it’s used. Maybe you’d anonymise things so that people can still have ratings & trust but be anonymous. You don’t particularly want them knowing which organisation the code resides in or what it’s used for.
Anyway, this site is a bit like stack overflow but for people to review code and find bugs.