As I said, I literally have streamed entire leafs (NHL) games and had plenty of space left to do normal things. If I'm not mistaken, Youtube data rate is 300kbps, which is 132 MB/hour. So 6GB would give you theoretically 46.5 hours of youtube videos. You're trying to tell me that that isn't "basically unlimited"? Seriously?
Hell, basic wired internet in Canada starts with a 25GB cap. 6GB is more then 99% of people need for mobile.