> But my first thought was that it will almost certainly be cloned and sold en masse pretty quickly, so I hope she gets enough revenue from it to pay for her time.

The reason why this isn't a thing yet is a few reasons - from my humble perspective:

First, it's actually a 2 part system.

You need the coat hanger but you also need the coat rack, more specifically - the dowel, to be really close to the wall.

So you would want to sell this as a kit. She doesn't really talk about it in the video - it feels like an odd afterthought. The kickstarter has it but only at the $135 starting level.

Secondly, it's not a "one size fits all solution". I can't use this with really bulky jackets. I think it's a cool, front door, guest entryway piece.

Last, it's pricy - really pricy. You're asking me to pay ~$15-20/hanger. If you have this specific problem... still hard pressed - definitely expendable income level. But because it takes up more width, it can hold fewer items not a general place to store clothes (hence i think guest front door would be a cool-piece/talking-point).