I agree that an Acknowledgments section, that specifically includes people who made real contributions, is better than just listing the GEDCOM uploaders. Though I think the same argument might continue over who to include in such a section. I think someone who merges all the duplicates of a person, cleans up the profile, hunts down and adds sources, etc., is way more important to credit than someone who uploaded a GEDCOM with no sources in it, with erroneous parents (connecting to French nobility, of course), no bio, etc. So as long as it focuses on crediting people who really contributed to the tree, I'm happy.