Maybe if we all trained with the fear that it could show up in YouTube, we'd all up our skills.
I committed early on to posting my 6th kyu test. It definitely added an extra level of focus in my practice. (Not that I wasn't plenty motivated before.)
Sensei also uses video in the In Focus seminars at our dojo*. It can be painful to watch ("Oh no, do I really look that floppy?") but there is great value in the feedback.
Look for my 5th kyu test on YouTube.. oh, maybe around April.
*Bless his heart, he does not post them on YouTube!