I definitely disagree with your views on this. There is a lot of garbage teachers on youtube and that is the problem that some have been influenced by them. However, on the other hand, there are some excellent Christian apologists, theologians & Pastor's out there who have great credentials, who are Bible scholars and have spoken on these issues, and it is obvious when some Christians have been listening to false teachers or others on youtube who are misrepresenting Christian teachings.
Personally I think posting VIDEOS can be a very valuable teaching tool, it's thoughtful to pass on these helpful resources to others, and it stimulates discussion, some however won't bother to spend the time an listen --it is their loss. There are some Godly anointed individuals who are of great value to take the time to listen to.
If you are not into that then don't , but please don't try to discourage the practice of posting VIDEOS that MANY might benefit from watching.