Didn't sourceforge used to be the most friendly open source place then they did something which I forget which got them binned. I think the problem with Github is the low barrier to entry for another open source hosting entity if the typical MICROS~1 action of Embrace, Extend, Extinguish were practiced on GH.
SorgeForge started injecting adware into binaries distributed via their platform. They had been on a downward trajectory for a while, but after they started doing that they fell of a cliff.
I worked for a company that used the on-prem version of their forge back in the 00s, I remember liking it alot. It felt novel, cool and useful to have fully interlinked bug tracking, version control, documentation, project management and release management.
They started shipping installers with de-facto-malware, but at a time when they were already on a downward slope. It was many years after "sourceforge was the default place to host FOSS".
