The problem with EA (for the studios) is that EA screams louder.
What is the first thing you see in a EA game ? That damn EA logo, then for a slip second, you see some random no name company (the studio).
The game publishing industry is trying to mimic the movie publishing industry by doing the classic " presents... a movie"-introduction.
By sad part is. The avarage gamer is a lot less intrested in who made the game, then the avarage movie enthusiast. So they only notice the EA logo and get reminded to turn off all brain activity for 5sec because, well, every one hates waiting for the game to start.
The movie industry can do this because its more or less part of the build up, and for the enthusiast, its just another reminder that this movie is made by the awesome studio, .
Back in the old days. A game would open with the studio logo, and if the publisher is lucky enought, they get there very own screen to present there name, else they would just have to do with a "published by" in the end credits.