I2P can import/export reseed files. Yggdrasil pretty much requires that you manually specify peers to connect to (for the first hop, anyway). ZeroNet will work with pretty much any tracker you throw at it. What does Tor have if the indexing servers and dirauths go down?
how is that tree flying
If the last attack on V3 onions has shown anything, it's that nothing aside from this exists and everything will disappear if something permanent happens to the main infrastructure of Tor.
Tor's design is defected. Only several authorities servers' down causes the whole network's down!