All of these MOOCs lack true verification of knowledge. Ultimately I think that the certification test should be done in person, at a cost to the person taking the test, since they are the ones who benefit most from the legitimacy of the certificate.
Also the signed certificate should include a clear photo of the person who took the test.
Does Mozilla publish their income sources? I know google was a large contributor in exchange for having their search on the initial page, but I'm no longer sure that's true.
I think a more useful setting would be clipping the beginning and end of an mp3 since in a number of instances the videos for the songs on youtube have intro scenes and whatnot before the song.
Does this use youtube-dl on the backend in some form? Any plans to release the code?
Also the signed certificate should include a clear photo of the person who took the test.