[EGreg]

Any product that took a lot of time and effort to build before it was launched.

Such as Lightbulbs, Cars, Airplanes all famously took an incredible amount of tests and funding before they achieved product market fit :)

Fundraising is more a function of having access to capital by knowing the right people or being inside the right company, than about the product. It’s rare that the product itself is such a new and revolutionary idea that has a simple implemntation — but perhaps that happens occasionally whenever a new platform comes out.