It’s one thing when a company gets the benefits of people’s contributions and doesn’t give back (in the form of source code when they build upon it and at the time they offer binary files). If a company wants to do the work themselves… well now they don’t have too.

GPL promoters typically value software freedom, and may believe it’s generally bad for society when software is proprietary. I don’t know what coreutlis does but I doubt there’s a thoughtful reason to choose MIT license for a clone.