From what they wrote, "small startups" are part of that "corporate world."
From my experience, the cultural differences between large corporations, and smaller startups, is night and day.
Often, neither one is functional; but they are dysfunctional, in different ways.
For myself, I was never happy until I was able to helm my own ship. A lot of folks think that this means "hobby programmer," but I don't actually fit that template.