To me original motivation is solving a problem and innovation. If you come up with an idea to create a service/product, you may be invested in the innovation in the beginning. But, as soon as you start making it using other people's money, it starts being less about the product.

[Edit] https://www.youtube.com/watch?v=f61KMw5zVhg&ab_channel=batxg...

Richard Feynman, explaining if "it" was worth the Nobel Prize.

"...I already got the prize. Prize is the pleasure of finding the thing out, kick in the discovery, the observation other people use it. Those are the real things..."