They didn't. They just patched it and changed a few things around.
They would've if they had the rights. When it comes to Dune games, nobody has the rights, since they used a third-party licensed, and that third party was the Herbert estate that effectively banned the use of the license in all commerical video- and board games in the early 2000s. Nobody can pick the license up: the Herbert estate didn't make the games, EA isn't allowed to sell, support, or claim anything Dune-related. Hence, there is zero consequence for fans to distribute them freely.