So tilly gets an email, tilly either doesn't care and does nothing, or he does care but the options are absolutely ridiculous to persue. It's just a waste of time. This isn't someone including the entire linux kernel in a closed source distribution. This poses no threat to free software. It's not even as serious if I were to copy the text of your post and post it somewhere else. It would be much better for the teacher to spend his or her time thinking of a suitable and constructive consequence for the plagiarism.
If you wish to discuss this further, email me at this address and save PM bandwidth.
To keep this extremely short. It's a trivial amount of bandwidth, if Perlmonks wished to save bandwidth they could save way more in other areas (ie don't display the cb on the main page (think of all the refreshes)), and most importantly information and discussions should remain public in such areas so all can benefit from, and not duplicate unecessarily, the information. If Perlmonks is not able to do this, another forum would move up and take its place. Worrying about a couple extra posts for bandwidth's sake is very counter-productive.