Can permissions for AWS Managed Policies be changed by users?

AWS Managed Policies are designed to be predefined sets of permissions that AWS provides and maintains. These policies are immutable, meaning that the permissions included in these policies cannot be modified by users. This design ensures consistency and security across AWS services, as changes to these policies could lead to unauthorized access or other security risks. Instead of changing AWS Managed Policies, users have the option to create their own custom policies that suit their specific requirements, allowing for greater flexibility in managing permissions according to their particular use cases. This distinction underscores the importance of maintaining clear boundaries between AWS-managed security and user-defined security measures. Consequently, while custom policies can be tailored to specific needs, AWS Managed Policies remain unchanged and maintain their original intent and structure.