
These companies will not bother to contact any of the people listed in your resume as a reference.
I know this from experience. It is not even a necessary part of the writer application process at these companies.
They are just so wanting to fill their writer quota that they don't care about your references. So you can rest assured that your professors were not contacted for any reason. In fact, they avoid calling references because they do not want to blow their cover. I believe that the minute they saw the job description or title of your reference, the HRD of that company made up their minds not to call for a reference.
After all, the professor can turn it around and start questioning them. I sincerely doubt that your professor would judge you regarding your choice of work applications. It is a form of employment that will keep you afloat and your bills paid.
In such instances, who cares if you are performing an academic assistance for the students in need? I doubt if your professor(s) would take it against you.