I have always been wondering to pay for a course at Udemy, but never got the right motivation and the time to shift there. After reading your article I'm quite thankful for the insight. Alone the fact that content is stolen, being marketed as their own and then getting paid for it, is something I wouldn't consider supporting. But although you might not be the first one writing about this issue, it doesn't keep people from going there and purchasing a lesson or two just for the fact that it is cheap and therefore more convenient.
Which is a problem in our society. Just because it's cheap it doesn't mean that it's good, and if it is, theres always some sort of string attached to it, like the content creators or lecturers who don't gat enough for the courses as they would like to.
Thanks for the update!