Because riding around unsafely is a good way to end up in the back of an ambulance.It's not about the $, it's about the survivability of an accident.
Yes. That tends to be why they're banned by most countries.The dud bomblets stay around, and get picked up by kids. Then go boom.https://en.wikipedia.org/wiki/Convention_on_Cluster_Munitions
Curve25519 should be fine.