Speculations:
- In, where "in" suggests an inclusion (being within), and Fictive, where the characteristics of fiction are implied. "In fiction," within fiction.
- In as short for infinite, where infictive is an infinite loop of fictions.
- In as a variant of not, where infictive is not fiction.
- Infictive as a play on infective, suggesting the intent is the establishment of a certain set of mental pathogens in participants.
- Infictive as a play on invective, suggesting the intent is to insult and assault participants.
- Inficitve (inficitue), Latin: to tinge, to discolor, to poison, dye, taint, stain, corrupt, imbue.
However, it ought to be noted that all the above speculations are based on an understanding that the name "infictive" is derived from an English or European-language origin, which is hardly the case at all.