A bounty program's scope is crucial for its success, as it determines what can and cannot be tested by researchers, thereby ensuring they test only the desired aspects of an organization's application or service. It's essential to avoid ambiguity in the scope, as this can lead to misguided researchers testing outside the intended boundaries, wasting time and resources. A clear scope also requires understanding one's attack surface, which involves knowing what parts of the application are vulnerable to attacks. By prioritizing targets intentionally, organizations can ensure that researchers focus on the most critical aspects of their application or service, ultimately leading to more effective testing and better security outcomes.