I have a family member who is a professor in broadly the same field as the lead researcher here (Sarah Cefai) and asked them if this kind of research would be seen as unethical in their field. This is what they said (also they are mostly unaware of the history of me/cfs and how patients were psychologised etc.)
That’s pretty one sided indeed. But (a) they are open about it, ie only looking at recovery stories to learn from them, which matches common practice in her field - for instance a study on lesbian life experiences doesn’t have a blind control of straight women or gay men, it isn’t epistemically justified (b) and it may correspond with her personal experience. But if (c) they don’t dig into the commercial reasons behind the videos and don’t disclose such rumored links then it is indeed unethical!