That's Udemy's own fault.It's their own lack of prioritizing that any of their new courseware writers have not broken any copyright issues before accepting them as official Udemy authors/courseware.If they want to be nonchalant or trivial about it,then let them answer the consequences.It strikes me that their own marketing on the net is somewhat iffy.It's a good thing we now have the powerful Udemy Unlimited ripper software methinks