Page and Brin ran Alphabet as a highly funded system of moonshot programs with near-infinite runway to make profits, which is unusual or unique. Basically it only worked that way because Page and Brin were idealistic visionary gazillionaires who were bored of thinking about the somewhat dirty business of selling targetted ads. With a more standard corporate governance under a common CEO with the google ad business, the expectation is a more standard corporate focus on making profits from its ventures in some defined timeline.
But read Levine's version; it has detail and humor and insight I can't convey in a summary!
[1] https://www.bloomberg.com/opinion/articles/2019-12-04/alphab...