No medical or financial company has this vibrant engineering IT culture like the web startups 20 years ago had.
Everything was new and exciting, and things moved foreward exactly due to the flexibility of all involved, the uncertainty, the flat hierarchies, and the fact that many rules either didn't exist, or only existed on paper.
This is what happens everytime a new market emerges, where structures need some time to settle.
Once they have settled down, procedures become standardized, but they also become so boring that all innovation is lost.
What happend at Youtube 12 years ago is exactly what happens right now at some Cryptocurrency start ups. The start ups that are succesful are exactly those start ups where people like this Youtube engineer do not get fired. If YT had such an authoritarian attitude in 2009, they would never have become succesful.
It's easy for the blog author to say "I have no idea why we weren't fired" but I bet back then it was all fun and games. (Getting fired isn't even that bad, what really harms people is when everyone around them starts to tell them things like "You could have ruined everything!")
And something similar to the excitement and fluidity within the Youtube of 12 years ago happened 80 years ago in pharmaceutical companies, or 200 years ago within a Bank, when such structures were still freshly formed.