Millions of people use SourceForge, many without knowing it. It's one of the only hosts that make available free open source binary download hosting (Github doesn't, Google Code is discontinuing it).
Most Windows users have no adware at all, but you likely already know that.
From the documentation, this seems only geared towards specific ZIPs of what is already on Github and is discussed as such in all press announcements. Basically, an easy way to have Acme 1.0, 1.1, 1.2 zips of code alongside each other as easily accessible zips. Nowhere is it indicated that this is for binary installer releases (EXE/MSI for Windows or DMG for Mac) or that these types of installers and their large associated bandwidth requirements are supported. Is this clarified somewhere else?
from the blog post: "You can also attach binary assets (such as compiled executables, minified scripts, documentation) to a release. Once published, the release details and assets are available to anyone that can view the repository."
Most Windows users have no adware at all, but you likely already know that.