Where can we report mod abuse?

No.101766 ViewReplyOriginalReport
Why is the mod on /a/ allowed to delete an existing thread>>210530416 so he can replace it with his own thread here>>210538517 even though OP of the deleted thread complied with the rules>>210538723.

He did the same thing before replacing this thread>>210448841 with own >>210450748 mere seconds after he pruned the existing one>>210457923