Largely because its not worth the hassle of going after each person and many companies often see this as free advertisement. SE shut down the remake project but as we can all see the "Tribute Video" is alive and well.
Honestly Copyright Law is a bit tricky due to the language used in the laws and also because many of them were written without proper foresight into how the Internet and technology would change things. I mean the NET Act was intended to allow film and music companies to criminally prosecute peer to peer websites like Napster back in the day, but due to the ambiguous language a company could theoretically press criminal charges against more innocent fan works. They don't because its a waste of money, often its not hurting anyone, and it looks bad when a company tries to sue a twelve year old for drawing fanart and selling it for a dollar on the school playground.
This is a fun video to explain it...






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