SourceForge never updated UX, some devs still use it but indeed github won. I think federated social interaction will win at some point. Git is distributed itself, but user accounts, follows, notifications, etc. would benefit of federation. Forgejo might make it sooner or later .
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It was shit and GitHub is good. It's not a mystery. It's still shit compared to GitHub, you can go and look now.
There was also an incident where they started adding malware to downloads... But really it was already dead by that point.
They were prevalent. Then they started with adware. Then they bundled adware without developer consent.
Eventually they were bought with a goal of deshittyfication. So theyre fine and have good offerings, but the UI and UX is much worse than other platforms (never improved).
https://en.wikipedia.org/wiki/SourceForge#Adware_controversy
Github is going in a a different, subjectively more harmful, way.
But it'll probably be a round for a long while yet.