I don't think it's right to reject contributions for no other reason than:

I don't think it's right to reject contributions for no other reason than:ReasonBadly Formatted.Your contribution has been declined.Your contribution did not meet our formatting standards. Please review our submission guides.

In contributions that pass the expected filter without problems, the reviewer who declines, out of courtesy toward collaborators who act in a completely altruistic manner, should explicitly indicate the violated rule.