An open source project is a lot of work. There are features to be built, bugs to be solved, releases to be made, documentation to be written and the inevitable support you have to provide via GitHub issues, Twitter and mailing lists.
Like anything worth doing, throughout this process there are hard problems that need to be solved. Valued contributors are ones who study the project's philosophy, understand the subject matter and are thinkers who gift their experience and time to the cause.
Therefore a person or a bot who joins in with a pull request that was a result of running a tool against the project's source code—like code linting or stripping of unnecessary whitespace—is a lowest form of contribution there is. It makes the statement: “Here, I didn't bother to see what current problems are in need of discussing/solving, so I ran a widely available script from the command-line t