I feel like that's SourceForge's job. When something gets excitement, that's the last time you want to throw up a page like this. Poor user experience. Would, say, GitHub do this?

I suppose something else could be afoot, but I feel like controls should be in place for that elsewhere, e.g. you can't upload a gigantic binary.

What's going on here? The page is hosted on the scikit-learn.org domain, and I don't see any redirects or frames pointing to SourceForge. Or is SourceForge allowing projects to point arbitrary domains at it?