And, as much as I love them, their entire business is predicated on wholesale violation of local ordinances restriction hotel and short term stay operations. Those ordinances may themselves be corrupt and unethical but they're still laws.
Tesla and Uber's defiance are for things that are pretty hard to justify.
As the multitude of airbnb horror stories show, anti-subletting rules and the like are usually there for some pretty valid reasons, and it's in a different category of illegal.
I, for one, am glad that my neighbour isn't inviting a bunch of strangers into his house every other day.
Unethical behavior and marketing are notorious in Silicon Valley, where so many have this "holier than thou" mask on, and make public statements such as #2 on YC's list, yet use every unethical trick in the book to reach critical mass. They say that, yet they do this https://www.google.com/search?q=airbnb+craigslist+spam
One could easily classify growth hacking as a dishonest sales tactic. The amount of Facebook autoposts and obfuscated referral URLs I've seen connected with YC companies are staggering.
As I understand it, "growth hacking" simply refers to the practice of treating your company's marketing as a software project; of systemizing it, making it measurable and repeatable.
This is one of the reasons I am not in love with that word. For better or worse, for at least some people it is strongly associated with "naughtiness" in the sense talked about here: http://www.paulgraham.com/founders.html
At least some growth hacking tactics are examples of taking someone else's system and convincing it to do things that its makers had not envisioned. The paradigmatic example was Airbnb building a deep Craigslist integration via a process which does not wholly fail to resemble security research. http://andrewchen.co/2012/04/27/how-to-be-a-growth-hacker-an...
The grey area on this one is so big that I don't even know where to begin...