My hunch was that it originated well before iOS, and could be traced back to forking KHTML, but if that hunch was right I can’t find any way to validate it.
I've found wiibrew.org and hackmii.com in there which are both Wii homebrew sites that became popular around 2008/2009 and probably declined in popularity starting in ~2012/2013.
Then there's also wiiu-developers.nintendo.com and wiiudaily.com which probably didn't exist before late 2012 or early 2013 when the WiiU was released.