When can I buy an SBC with one, that's within one base-10 order of magnitude of the Raspberry Pi's price?
https://content.riscv.org/wp-content/uploads/2018/05/14.15-1...
http://www-users.math.umn.edu/~arnold//disasters/ariane.html
Ariane was the most competitive / succeful private launcher for 20 years even in face of American companies.
SpaceX is however currently disruptive them, like every other actor of the industry.