alt Hacker NewsThere was never any such incentive. MS Office formats were undocumented for years because MS had no incentive to document them. Merely using files did not help at all. Actually the vast majority of all file formats have never been open. Think about all the custom file formats used by video games, for instance.
I actually talk about this in the article. Merely using files is how we got out of the dependency on MS Office. Multiple efforts reverse-engineered them, including Google Docs. Yes they were undocumented, but as long as stuff has to be stored on the disk under user’s control, the overall dynamics are very different from you-can’t-see-the-files systems.