Why? I don’t get it…

Somebody please explain this to me, because I honestly don’t understand:

I feel like there’s more and more videos on youtube where I get this message:

This video is not available in your country due to copyright restrictions.

And I don’t get it – what is the advantage of this? I can’t see the video I want, they don’t get me seeing their ads. I don’t get to share videos I like (or see videos other people want to share with me), they don’t get my mouth for their mouth-to-mouth ads.

Please, someone with a better grasp of corporate reasoning/youtube/copyright law, tell me what is behind this? Because it’s frustrating as hell and if I could at least understand it, I’d be a lot happier.

Thank you.