Comment by Mbioguy

Boy are you in for a surprise. Medical school lectures are mostly optional these days and are entirely skipped by a significant proportion of med students in favor of resources like Strong Medicine (literally a YouTube channel), gigantic Anki digital flashcard decks (see reddit.com/r/medicalschoolanki), UWorld, First Aid, Sketchy, Pathoma, etc. 'High Yield' is the buzzword for resources that are a better use of time. So yes, you almost certainly will trust a doctor someday who was educated at least in part by YouTube or comparable online resources. You just won't know it, since the paper on the wall will say "University of X". And as long as they pass the boards and make it through residency, does it matter?