You're incredibly naive and I hope you don't end up feeling screwed over by one of the big companies in a few years.
We'll be known as the team that created and grew the project, and we'll have a guaranteed job at Amazon and a bunch of other places doing something we have unique experience with.
My goal isn't to leverage open-source software into enough of a moat to build a billion dollar company. If it was, then I might be unhappy if Amazon broke that moat.
I'm totally happy building a sustainable small business. Maybe even one that won't last forever. Our team is small, our costs are low, and we are comfortable. We are growing, sustainably, and providing real value to our customers in the process (or they wouldn't pay us the rates we require to stay in business).
I mean, in our case, we're building a geocoder. We'd have to raise, no exaggeration, tens of billions to build a moat considering the current market leader is Google. There's no way to guarantee that outcome.
On the other hand, there is _so_ much room left after Google for other companies if they don't have to get massive. There's room for us, and at least a dozen other companies I know of that have their own take on geocoding that their own customers appreciate.