Probably because the ultimate end of these course isn't to make money by yourself, but by engaging in an MLM and let it work. There's a company engaging in MLM

Probably because the ultimate end of these course isn't to make money by yourself, but by engaging in an MLM and let it work. There's a company engaging in MLM sales paying some news agencies to promote its scheme every day during the news (a subtle sponsor, so to speak; it's on regular TV so SponsorBlock won't help). As my family watched the news from this channel often, I would recognize how it works. It would promote an online course along the lines of "Make Money with a Smartphone" and advertised the course it claimed to cost $249.99 at $2.49 (price may vary, depending on who is the presenter, though the course are the exact same). The news program is careful not to show the names of the ultimate company offering it, only presenting that this person will be teaching. Sharp-eyed viewer, however, can notice that those adverts intend to direct the prospective "client" to an MLM.