I expect that the big issue with using a cannon to launch things into space is that the small payload must be resistant to this sort of extreme acceleration.
Extreme acceleration and extreme heat from extreme velocity in the lower atmosphere.
Problems that could be solved but at what cost? The marketing for this is the reduced cost --- which may or may not hold up in practical terms with real satellites that are usually more than a simple projectile.
In other words, the cost to engineer and build a satellite capable of withstanding the launch may exceed any savings.
Somehow I'm more skeptical about their claim that electronics can withstand 30,000G than that they can make this launcher work. Very interesting approach anyway.
The proximity fuses used in WW2 naval AA guns could handle 20000g and were using vacuum tubes. Electronics are more durable than you give them credit for.
