This comment spam is terrible. They add some "great article" nonsense even to posts in the wrong language. It does take away the fun a bit and the same goes for the spam articles. It's not just video posters, but also these 1 picture without text articles of which most are annoyingly nonsensical. But then again, I don't think that they have much success with it. They rarely get an upvote, usually they get unfollowed or muted and at the end these posts end up in a void. Or don't they?

PS: Your idea with the no-bots image is not bad. Maybe it could be made a standard that if a specific tag or image or sentence is added, bots stay away from the comment section.