My visiting niece called me to the computer and asked my help with an online assignment. I didn't realize until the end that it was an exam. (I would have helped her even if I had known.)
Several years ago a student told me his aunt got an online college degree for her son who was serving in the army. He told me his mom was going to do the same for him.
And this, my friend is the problem with online courses. The professors have no way of knowing who completed the assignment.