I feel like they're just spam. For example, theres this yo-yo video that was posted twice (here and here) at about the same time, most likely from the same person. Some users (cough /u/ThilebanTheEngineer) spammed this subreddit with 7 video posts about 10 days ago.

I feel like this subreddit is more of a community than an opportunity to gain views on a particular YouTube video. Its getting kinda out of hand, I propose we ban these Khan-Academy-esque videos from the subreddit. Thoughts?

My reasoning is that if someone wants to get some video suggestions (like in this thread) then these users can simply plug their channels over there. Publishing it to everyone is doing more harm than good.