I'm pretty sure that that's meant to apply to music/video bought from iTunes, not the use of boughten apps
http://ursecta.com/wp/2009/08/anything-but-games-are-illegal...
A quote from one of the linked articles (The Register) at the bottom:
"Apple is reminding customers that applications sold through the iTunes store are strictly for non-commercial use: business use is forbidden, which makes one wonder what that section of the store is for."
I'm sure this is taken out of context.
Perhaps the situation has been clarified since then.