These are not bugs; from the CourseDevil’s perspective, they are features that increase student dependence on support tickets and retake fees.
Copyright infringement is a statutory offense in the US and EU. While individual downloaders are rarely sued, moderators and heavy uploaders face felony charges. The Digital Millennium Copyright Act (DMCA) allows for damages up to $150,000 per infringed work. If you accidentally seed a course back to the community (using P2P protocols), you become liable.
Pirated courses degrade rapidly. Videos are often re-encoded at 480p, workbooks are missing pages, and source code is corrupted. You might spend 10 hours debugging a broken project file only to realize the upload was incomplete. Your time is worth more than the $100 you saved.