Random thought

How come the company fighting the hardest to prevent properties from becoming public domain is also the company that has profited the most from it?
Just some of the Disney properties based on public domain sources:

Snow White
Cinderella
Sleeping Beauty
Beauty and the Beast
Aladdin
Pinocchio
Pocahontas
Treasure Island
The Little Mermaid
Alice in Wonderland
Robin Hood
The Sword in the Stone
Hercules
Hunchback of Notre Dame
The Jungle Book