I have also noticed this when posting comments containing certain words (that seems to be what is happening here) or when posting links. It can be frustrating i

I have also noticed this when posting comments containing certain words (that seems to be what is happening here) or when posting links. It can be frustrating if you want to back up your comment with a source. I guess it's understandable given YouTube's scale. Easier to just remove all comments with links than to do more advanced spam detection.