I wouldn't extrapolate too much from the observation you made about Google producing more founders. Both companies are "corporate" in that they have lots of jobs dedicated to keeping the company running, but have no direct impact on the revenue streams. A good example would be a license manager who negotiates licenses with third parties and makes sure his/her company stays in compliance. I'm sure there is at least one of those positions in both Apple and Google.
Without knowing a breakdown of the people who left Google to become founders, it's hard to draw any meaningful conclusion. The 20% time policy may have given engineers ideas for their own products. Or, Google may operate like an startup incubator for its own products, so employees feel very comfortable with the mentality and pace of a startup. Or, you may be right that Google is more "corporate" than we think. Who knows?
Without knowing a breakdown of the people who left Google to become founders, it's hard to draw any meaningful conclusion. The 20% time policy may have given engineers ideas for their own products. Or, Google may operate like an startup incubator for its own products, so employees feel very comfortable with the mentality and pace of a startup. Or, you may be right that Google is more "corporate" than we think. Who knows?