A campaign manager would have to work full time to do such in depth checks for every single post and to run them through a plagiarism checker. After that he would have to filter out posts that he suspects are plagiarized and compare them further with found sources... That is an awful lot of work.

50 members per campaign posting 25 posts each (minimum) equals 1250 posts per week. Not to mention that sometimes only parts of the post are plagiarized so during the initial checking he could think everything is ok when in fact 2 out of the total 20 sentences are copy/pasted.

My question to campaign managers, would you really go through all this hassle?