I haven’t thought about it before, but apart from all the obvious reasons why SAFEnetwork will blow all these other projects out of the water if it hits its goals, the crucial factor for projects of this type will be the ability to survive in the face of governments that turn against them (which is increasingly looking like all governments as they become ever more authoritarian and oppressive).
I don’t know of any other project that takes this issue head on and might achieve it, although as I said, it isn’t something I’ve gone into in any depth.