It's only line-of-sight, but isn't the range 10s-100s of kilometres in open areas? Some repeaters on hills/mountains etc. could connect large areas potentially.
It's trivially jammable, as evidenced by the network not working at popular events such as Defcon with default firmware settings.
Nope. Uses only one frequency that quickly gets crowded and if you are in urban areas you'd be lucky to get more than 200 meters.
It is a toy. A cheap Quangsheng/Baofeng for 20 euros can reach a few kilometers in urban area, use multiple frequencies and go for 100 kilometers easily on LoS. They even reach Australia from Europe when using a wire antenna large enough.