[Terr_]

Ultimately it's about where we draw the line for hacking other people's brains.

It's a spectrum: Some level is an unavoidable part of communication ("I like dogs" forces you to think of dogs) some more is considered normal and traditional manipulation ("My food smells nice, that makes you hungry, wanna buy?") and then it goes on into grey-areas, scams, and eventually to potential extremes like "this image induces nausea" or "this sound knocks you out".