Oracle proposes donating OpenOffice.org to Apache Software Foundation

OpenOffice.org doesn't really fit well into the .PNG example. For one, much of the value for end users isn't much to do with ODF: it's the ability to interoperate with Microsoft Office.

But even if you look only at ODF, the issue there is more akin to web browsers than a library. ODF doesn't have a specific rendering system (nothing mandates a document be laid out in any particular way to conform to the standard), doesn't have much idea of conformance, and could be implemented in a variety of different ways.

I daresay, though, the main reason there are specific people strongly pro-copyleft is that the community has been burned a number of times now.