According to the Code of Student Behaviour ("the Code"), one subsection of Cheating reads:
30.3.2(2)c. No student shall represent another's substantial editorial or compositional assistance on an assignment as the Student's own work.
This begs the question: what does "substantial" mean? Applying this section is difficult precisely because it requires discretion.
When you use tutors, editors, or other academic services for assistance on an assignment, the ideal outcome is that using that type of service will improve your own abilities so that you can submit better work. Unfortunately, some students slip into a situation where the tutor or editor simply “improves” the assignment rather than providing the tools for the student to do it. The extreme consequence of this is that the assignment becomes something the student would not be able to replicate because, in effect, it was completed by the tutor/editor.
This is not about punishing students for improving the quality of their work. After all, instructors provide feedback on assignments and papers in an effort to help you improve. However, students can sometimes rely too heavily on the assistance of others, and that is when it crosses the line.