Growth Hacking is a term used by people who are not developers and certainly not "hackers" in it's original sense, it is a term derived by people in marketing who want to jump on the "hacking" bandwagon they keep reading about.

Whenever you see the phrase "Growth Hacking" in any context, stop reading, close the tab, turn the page, otherwise divert your attention as anything following this red herring of a term will be marketing doublespeak and otherwise useless garbage.

Sadly the word hacking has lost almost all meaning and is in it's death throws. Shame too.