Didn't work so well for Dropbox because they failed to emulate the 40-year-old technology of WYSIWYG editors. Then again, GDrive still makes desktop users suffer the touch-first interfaces and non-customizable gigantic touch margins, but at least their spreadsheets and doc editor more or less work. Some day, one of the most valuable companies on the planet will finally solve the intractable problem posed by filling in PDF forms in a way that works every time and allowing them to be printed as-filled. I'm sure a few more trillion in AI will solve this some day.