What is the difference between a massive flop and a massive success?
The gap is smaller than you think.
The difference is not the product.
The difference is the problem the product solves. Context beats content.
I found BusyBox on a crowdfunding website and was captivated by the success. I have seen similar products several times absolutely fail.

The answer is not simple "product-market fit" because, as entrepreneurs, we have the ability to define our market. How does this work?