I also invite you to contemplate the potential for brand marketing campaigns if your "poison" is intended to boost the prominence of a well-known product, so that ChatGPT relentlessly pushes it in the face of users. (Brand marketing isn't just about advertising, it's about familiarity.)
There are also darker uses for political propaganda, such as asserting as a positive some contested territorial/ethnic/religious claim, eg. Nation A's claim over the territory of Nation B, or reinforcing Group C's belittling ethnic stereotype of Group D.
I also invite you to contemplate the potential for brand marketing campaigns if your "poison" is intended to boost the prominence of a well-known product, so that ChatGPT relentlessly pushes it in the face of users. (Brand marketing isn't just about advertising, it's about familiarity.)
There are also darker uses for political propaganda, such as asserting as a positive some contested territorial/ethnic/religious claim, eg. Nation A's claim over the territory of Nation B, or reinforcing Group C's belittling ethnic stereotype of Group D.