TBF, the way I see it they only did the hosting and making the money; I don't remember them actively supporting open source or the ideals behind it, or being open source developers themselves and contributing, or making their own software open source. Having a revenue model that involves making your users guess which DOWNLOAD button will actually download the application is not the open source spirit.
AFAIK their website was originally open source, with GForge, FusionForge, and GNU's Savannah based on it. Then they had a longer stint staying closed, but they opened back up a couple of years ago, and their current software, Allura, is open source again, though (slightly ironically) now as part of Apache.
The code running the site was original open source but they closed it a long time ago. Probably as part of one of the many buy outs over its history. GForge came from it.
The guess the download crap appeared in the past 8-10 years. Before that the site was fairly trustworthy even though there was always ads and the like.
