"obtaining the students' consent to release their Wikipedia username (which could be a random string of characters with no identifying information) needs to be

"obtaining the students' consent to release their Wikipedia username (which could be a random string of characters with no identifying information) needs to be a precondition of the students' participating in the assignment." Why? "If a professor has 1700 students start editing Wikipedia and 85% of them are plagiarizing" This is still a number pulled from the air.