User blog comment:IamJakuhoRaikoben/Chapter 496: Forward, Review./@comment-27337151-20160803065130/@comment-2214433-20160805044117

J. K. Rowling had her first Harry Potter book rejected by like 7 different publishers before someone appeared to actually publish it. So yes, if they publisher thinks the novel isn't up their alley, they won't publish it.

Mashima once tweeted that a whole chapter of his got rejected and he had to completely redo it.

Publishers have a lot of power here.