For small scale energy production small VAWTs [0] are relatively cheap, they offer more W/m2, and they are much more easily serviceable and installable.
For large scale production it's orders of magnitude less efficient, plus having multiple kites on the same plane brings in the wake effect [1] in full force. That's why regular turbines are generally laid in lines rather than wide surfaces, or with significant separation between them.
For small scale energy production small VAWTs [0] are relatively cheap, they offer more W/m2, and they are much more easily serviceable and installable.
For large scale production it's orders of magnitude less efficient, plus having multiple kites on the same plane brings in the wake effect [1] in full force. That's why regular turbines are generally laid in lines rather than wide surfaces, or with significant separation between them.
[0] https://en.wikipedia.org/wiki/Vertical-axis_wind_turbine
[1] https://www.wind-energy-the-facts.org/wake-effect.html