supermatt parent
Sure, but spacex are building on the shoulders of what came before. Easy to save 200bn on research and development if someone else has already paid for it and shares the results for free.
This is true, but also a bit trivial to observe. Even the Primitive Technology channel, which usually starts with mud and clay, builds on knowledge of other people.
The value added is interesting. For example, both the Merlin and the Raptor family of engines. These are some fine engines, and they are remarkably cheap and reusable.