Nice share, your work has been approved in Utopian. As always, great work is done here.
However, I believe that a better visualisation of the situation would be to make 1 January the split point for the data. There had been so many changes and basically, all the categories were more open in the past and their definition was broader.
That is also the result of your analysis part for contributors with the highest number of different categories. We can see that those contributors either left Utopian or stuck only to one or two categories.
Many contributors tried more categories but they often contribute in one and after some time, they try another one. I believe that only small percent of contributors actively contribute in more categories "at the same time".
Anyway, it is nice to read your posts and to have such summary.
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Hi @espoem, that's a very good point, thank you! I've updated the post to show the situation since Jan. 2018. As you already expected, there are less users contributing to more than one category now.