[BizarroLand]

Basic test for "Is this a good idea" is to check to see if someone else has already had this idea or one that is similar, and if they have ever executed on the idea, and how did that go.

So they shared their idea, and I showed them that Randall Monroe has already done the math and shown that the idea is dead in the water due to the extremely small amount of energy available to be extracted from rainwater on roofs.

If they didn't know this, hopefully they will stop here and pivot to something else.

If they did know this and made a functionally terrible but somewhat flashy looking website in order to sell this device anyway, then they are just looking for a sucker to bilk money out of.