Which is NOT a feature of effective cybersecurity mitigation responses to insider threats?

Implementing comprehensive user training is not inherently a feature of effective cybersecurity mitigation responses to insider threats in the immediate context of responding to an incident or threat. While user training is a critical proactive measure in fostering a security-aware culture and reducing the likelihood of insider threats through education on best practices and awareness, it does not directly address the immediate technical or procedural responses required once a threat is identified.

On the other hand, removing permissions to information systems, increasing user activity monitoring, and altering organization-wide policies are all direct and responsive actions tailored to control and mitigate insider threats as they occur. These actions enable an organization to limit access to sensitive information, monitor potentially malicious activities closely, and adjust organizational approaches to bolster security against insider threats effectively.