I'm not sure how applicable most of this code will be for other kite power companies. The Makani "kite" turbine was 2000 lbs. It definitely required Google-level funding to develop which is now gone. None of the remaining kite power companies that I'm aware of have the kind of significant funding required to develop this - ours ran out of money late last year.
Essentially the same code could run Makani's smaller machine, the 20 kilowatt "Wing 7", with a 7.8 meter wingspan and a mass of 60 kg. Many of the existing kite power companies are working on machines of this scale.
But we did have the luxury to design and build the system from the ground up, whereas scrappier startups might have to cobble together existing components. Hopefully they will be able to utilize some of the materials we've just released.
If I did, and I got typical government subsidies for wind power, I might earn $10k/year. That ought to pay for all the machines parts if I buy everything hobby grade from AliExpress. The 2nd year is pure profit assuming the craft lasts that long.
So that leads me to suspect the key issue is the various control algorithms can't be made reliable enough to run for years and years without crashing under any combination of gusts and wind conditions. Am I along the right lines of the issues?
https://plane-lyspoken.foxrothschild.com/2017/12/03/tethered...
Our COO gave a talk on the FAA approval process at the Airborne Wind Energy Conference (AWEC) a few years ago: https://repository.tudelft.nl/islandora/object/uuid:ea8256a2...
So yes, you could make a profit. But there is an alternative source of technology that makes the same power and has become really profitable in the last 10 years.