but that's a false dichotomy
It's a false dichotomy for self-funded/bootstrapped businesses. But if you consider yourself a startup, you have to deliver growth. It's that pressure that leads to the 70+ hour weeks. It's entirely possible to own and run a business while still putting in reasonable hours. But it's unlikely that business is a startup, by Paul Graham's definition of the word. A startup is a company designed to grow fast. Being newly founded does not
in itself make a company a startup. Nor is it necessary for a startup to
work on technology, or take venture funding, or have some sort of "exit."
The only essential thing is growth. Everything else we associate with
startups follows from growth.
By the "billion dollar mistake", are you referring to null references [1]? But null references were introduced in 1965 in Algol, by Tony Hoare. They long predate Java.
[1]: https://www.infoq.com/presentations/Null-References-The-Bill...