You don't need to crowdfund any more than it costs to convince a group with $1bn that they can make money on this by spending that to commercialize your demonstration. That is often just a few million, or even less, depending on how compelling your data and how good your connections.

Most of that $1bn and decade of time is make-work created by ever more risk-averse regulators. The actual process of creating something, making a product, and gathering reasonable data on safety is a fraction of that.