What does “abusing the system” mean for QA projects?

Unjustified QA reviews include the following:

• Reporting preferential changes as errors
• Giving a low rating for very minor, insignificant errors
• Not reviewing the translation at all and providing a high QA score. 

QA reviewers who post these and/or similar reviews may lose their QA Reviewer status and be unable to perform these projects in the future.