https://sourceforge.net/p/forge/documentation/Abandoned%20Pr...
I took over APNG project in 2011, nice short name, it was really abandoned, and I don't feel bad about it:
For example, for years, I've used winscp.sf.net to get to WinSCP when I need it. As of now it redirects to what I believe is WinSCP's actual site, winscp.net. In the past, Sourceforge was the actual location to get the binary. If at some point they set up a "mirror" for WinSCP, there's a good chance that people visiting that haven't in a long time might just accept that if they get a download link at a sourceforge page, it's likely legit.
I can't say the same about any of the sites you listed.