They likely had trouble making it cheap and durable enough for the target market. Looking at the design files, the unit is quite fragile, thanks to the cheap vacuum formed plastic.

What needs to be done is using some of the GIS tools they released to find good locations for air->water setups, is figure out what materials and manufacturing techniques are available in those locations. This way you are more likely to design something that makes a difference. Anything built with materials or techniques that are not local will break, and they will be unable to repair because they do not have access to either the materials or the tools needed to do repairs.