I read it as the files were a result of his normal web development. I'd assume he also uses git and the two things are orthogonal problems.

Sure, but if the .git directory is part of the folder in Dropbox (which is not a good idea anyway, btw) then git's internal data files are probably responsible for a huge number of those files.

My 8-people small company has 117k files using 110GB of space of Dropbox - 90% of word/excel/image files. Shouldn't I be worried if they will fix this issue in the near future?