Unit of Value: A Framework for Scaling (2016)
news.greylock.com
news.greylock.com
This reminds me of Tufte's "The Cognitive Style of PowerPoint". Highly recommended.
Startups are constrained by the same thing, the whole "doing it to save the world" is just a bullshit story, and monetisation will always rear its ugly head eventually, or the startup will die, because what is doing is genuinely good, but cannot be monetised or ads cannot be inserted in it ...