I think Frankie was trying to imply that he could turn all of his followers against Derrick, Cody, and Caleb and that they'd be hated by America in general after the show. He kept saying how they'd be "judged" for their actions. He seems to think he wields power as a "social media mogul" (or whatever he called himself) and will be able to ruin any chance the guys have to capitalize on their Big Brother "fame". When no one becomes famous (like all of the other BB contestants), Frankie will take credit and say it's because they betrayed him.
The word megalomania doesn't even begin to describe the depth of Frankie's delusions.
