The thought from the original growth of OSS was that it would be more about the community than the code. So OSS would be a series of communities that would each have their own "identity" for their community. There were big OSS foundations like Apache and Eclipse. Sun had several like java.net, OpenOffice.org and netbeans.org. Gnome had their own place etc.
Like Sun, other enterprises like HP, Oracle and IBM were setting up their own communities for their projects and to collaborate with partners.
And then as the post touches on there were sites like SourceForge, Tigris.org, Google Code and Microsoft had something too (CodePlex?). These sites were places projects might spin up if they did not belong at one of the other foundations and wanted a place to host their code for free. Of these SourceForge was often used for distribution of binaries due to its vast mirror network and often that was all that was hosted there and the project was elsewhere.
Anyway, until GitHub sprang up and started to consolidate all the OSS in one place, I do not think anyone else was even really trying to do this. Obviously the rise of git played a big role in this. This change fueled the growth of OSS but it did kind of come at the cost of losing out on some of the community aspects that existed before in the mailing lists and forums of these other places. Now collaboration all happens in PR's and Issue and is often just between a small handful of people.