Re signing etc, by the time you've downloaded something to check, its already too late?
SF used to get sponsored by big companies keen to promote their OS goodness e.g. IBM. But these days its a backwater, and that actually goes back to the Apple app-store and how that changed how many developers aimed their free-time. But practically, it means SF have nothing to lose and I'd expect a creeping-up-on-you strategy as Ishmaru fears.
I recommend MG moves to github, uses github releases, and hope all other live projects vote with their feet too. I don't think SF will ever see any error in their ways.