Most quilts are based on quilt blocks passed down from generation to generation. Most of the time, nobody knows who came up with the original design. Those designs are in the public domain, there is more than one way to make all of them, and nobody should care which technique was used to make it (did you speed cut or did you use scissors and templates?).
What bugs me is when the person who made the quilt top has the sandwich quilted by someone else, and does not give that person credit. To me, that is 'stealing' the work of another. I've even heard of some who say, "Well, I paid for it, so I don't have to give anyone else credit." If it's in a show, I disagree. If the quilting is that easy, then do it yourself; if it's no big deal, then why not give credit when due?