There's no reason to use all the open source hosting sites. Almost no project does that; the exceptions usually mirror their repository to GitHub because they're not cool enough to switch fully. ENIGMA moved to GitHub around that time, so SourceForge is no longer updated.
There's no reason to use all, true but people keep downloading from sourceforge since the project's page is alive and the downloads function, and those people see a project with 3 years without an update, since nowhere it says you should go elsewere to download the most recent version.
Also a legend requesting developers could be placed there, this could bring the hands needed, not a garanty but a posssibility but still.
Again just my two cents.