As mentioned later in the thread, I dont flag videos recklessly. Doing so could get your own account suspended. I should clarify the link posting since there is some misunderstanding. There are some sponsors on Youtube that pay to advertise there, like major household names you would recognize.
Flagging a sponsored video does not work unless a large amount of people do it, then automation will take it down. However it can easily be restored and when it is it will be immune forever. But if its something that gets a large amount of attention and thousands if not millions complain about it, with media attention etc. (like DavidsFarm) then Youtube may finally relent especially if other advertisers start pulling their own ads in response.
So to clarify, the link spammers are the ones who direct you to a site that isnt sponsored, that is not posted for a non commercial reason (like charities, instructions, news) and who isnt posting xxxx's of videos on multiple channels all spamming the same website.
Here are examples of spammed videos that youtube will remove:
https://www.youtube.com/watch?v=HTfEoy-hP7I
It has keyword spam, tiny url, movie images but no movie, links in video, suggested videos show that it is spammed over multiple accounts. By flagging one video with similar traits over all those accounts I can probably eliminate 200-300 videos just by using the suggested videos.
What a bot spammer channel looks like:
https://www.youtube.com/user/MAXoKluttz/videos
All videos exactly the same length, with the same content all leading to the same website. Flagging a few vids will take down 100+ videos and terminate the channel.
Software download, tips, tricks, etc spammer:
https://www.youtube.com/channel/UCR2Bn60PV4BFUJqi6fXt8Eg/videos
Posting 25 videos per hour.
Sometimes points to a blogspot page which can be reported and terminated, which I also do.
I could post a lot more. There is one idiot that started posting a website on how to meet women. He spams them as video responses, making that feature unfairly unavailable to others because of his spam videos. They are nothing but a soft porn picture that displays a link for 10 seconds. Going to one of his channels will show hundreds of three different pictures of the same girl with the same link.