I see the point you're making though (copyright violation by a for-profit company is just wrong, both morally and legally), and i upvoted to compensate.
But this is the exact opposite. This is a company flagrantly copying someones work without permissions.
And in ACADEMIA.
IIRC, you could be thrown out of school for plagiarism, we shouldn't disregard an academic institution doing this exact thing.
It's a problem that's explained and handled by the DMCA, the issue is making sure the company actually follows through with handling requests promptly and accurately.
But what difference does it make - it's the classic user provided content model and all the issues it comes with that's causing the problem here. No company, academic or otherwise, wants infringement and if there was a perfect solution then everyone would use it, however it's just not feasible to be perfectly defensive and catch everything.
They do have > 500 employees so it's a company big enough to have checks in place with other video providers to catch basic things like this but still, it's a much harder problem than people think.
If you'd like an example, Banks won't even OPEN an account in states that have legalized recreational marijuana, simply because it's still illegal federally, and they're avoiding liability.
I just thought I'd share, since I have firsthand experience in that particular industry (online payment processing).
I'm not saying they are immune to everything, just that the accepted and realistic option for any service that accepts user provided content is to handle takedown requests. It does place the burden on the copyright owner but it's the process we have so if Udemy or anyone else does follow this accurately then what is the problem?