Because as Master Shifu said: "There is no secret ingredient." Just as Po had to earn the Dragon Scroll, you have to earn the movie—preferably legally, and without a ransomware pop-up.
However, the internet of 2008 is gone. The wild west of Google Drive sharing has been replaced by takedown bots and malware farms. By pirating the movie, you aren't stealing from DreamWorks (they made their money back), but you are exposing your device to risk.
Now go watch the movie the right way.