The 'Raindrop' is a very trendy take on a time honoured practice, thanks for sharing. Those stories of alleged "unauthorized use of rainwater" are quite concerning, if true we can only hope such actions are the result of misguided execution of policies intended to keep people safe from harm of potentially health-threatening sources of non-potable water?

"Waste not, want not."

It only makes sense to make use of rainwater & greywater, but there are some caveats and considerations:

• Greywater usage feasibility is dependent on controlling input constituents, such as chemicals used in cleaning, salinity, minimising excreta or fecal matter etc, and restrictions on use, ie: non-potable water applications like irrigation and cleaning.
• Rainwater usage feasibility shares some considerations as Greywater, albeit with less concern of input pollutant, although there is still some possibility of pollutant loading, and in addition are considerations for methods of storing which could lead to heavy metal contamination, stagnation, insect larvae, algae or other microorganisms/pathogenic risks, all of which can affect the quality of the rainwater and restrict untreated safe use to irrigation and cleaning.

Australia has a long history of widespread rainwater harvesting and storage and thus has accumulated substantial empiric evidence of the risks, benefits, and considerations for water capture, reclamation, storage, and use. Here's an article by independent research group Urban Water Cycle Solutions on the perennial Rainwater Health Debate in Australia:
https://urbanwatercyclesolutions.com/rainwaterhealthdebate/

Access to clean water sources is well known to be not just a factor in health, but also societal stability.
http://www.globalissues.org/article/601/water-and-development

Ironic that an element constituting such a large proportion of our home world and indeed the human body, one that has such a critical role to play in sustaining life and function, should be so easily overlooked and taken for granted.