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The problem with GIMP
(www.spacebar.news)
This is a most excellent place for technology news and articles.
There aren't actual numbers because you can't poll for that. There's not a database somewhere that keeps track of every teacher or manager that says "ew" when someone brings up GIMP. There are some documented examples, though, some of which are listed in the article.
You can survey users of photo editing software and ask something like: