As Makani's Fort Felker said, this doesn't necessarily mean that Makani is shutting down. Its recent investor Shell is "exploring options" to continue work on wind kite technology, although Felker didn't elaborate on what that meant. The team did make some progress while under Alphabet's wing, launching a 20kW demo project, and growing it to a kite capable of 600kW.
As TechCrunch explained, this may be as much about Alphabet's shift to a more conservative strategy as anything else. When Google bought Makani in 2013, it was a company willing to take risks with many forms of technology, whether they were energy kites, internet balloons or smart glasses. The cost was almost incidental if it meant Google could get into a lucrative field at a very early stage.
Flash forward to 2020 and it's a very different story. Google is now just one part of Alphabet, and idealistic founders Sergey Brin and Larry Page are no longer part of the leadership. Alphabet is a more pragmatic company interested in turning a profit from all of its businesses, and that may mean cutting loose projects that are likely to continue bleeding cash, even if they're ultimately promising down the road.