I would find a better authority than 'youtube doctors' for the health of anyone you love. Some are great, but all are in it for attention. The ultimate motives of many online attenion seekers, no matter their profession are, lets say, unclear.

They are better then random programmers on HN who think respiratory disease can't be linked to heart problem due to respiratory in name.

I don't think anyone's denied that respiratory diseases can be linked to heart problems. The question is whether they're linked through the normal mechanism of systemic failure, or if the coronavirus specifically targets heart tissue as the doctor in the article suggests.

I would not describe teachers or those who post on HN as "in it for attention". Though I have not posted on youtube, I see no reason to describe those who have as attention seekers.

agree on the overall point, but the ultimate motve seems plainly clear to me: stature and esteem. it's an underlying motive too widely shared among the animal kingdom to assume otherwise.

whether any given youtuber deserves that stature and esteem is certainly unclear, as that takes direct observation of the person over time to ascertain.