You know, in the original Space Jam posters, Bugs Bunny wasn't credited as 'Billy West' in posters only in the end credits, and now people are making a fuss over it. While I do think voice actors should get credit for voicing the characters, but you also have to bring into mind the target demographic, which is mostly kids and families. I think they want to create the illusion that Bugs Bunny is a real character.