I'm not inclined go suggest dihonesty as a first explanation. Mostly, I think they are simply ignorant. Which is unfortunate, because people seeing a good quality video production and a lot of followers might assume greater knowledge and experience than they deserve.
Paris Hilton, for instance, has a lot of followers - but I wouldn't go to her for advice on establishing and running a hotel chain, notwithstanding the family name.
Feed is complicated. Doing it right takes more than a click and a 3-5 minute video.