Maybe I'm being small-minded, but I strongly dislike using the word 'plagiarism' to refer to cheating on your homework by copying someone else.

To me, plagiarism is taking credit for someone else's ideas at their expense; it's a "sin" against the person being copied.

Copying someone else with their connivance, or paying some essay-mill writer to do your work for you, should be in the same category as taking a calculator into a mental-arithmetic test, not the same category as « My name in Dnepropetrovsk is cursed, when he finds out I publish first ».