Scraping APIs with fake profiles isn't the right way to go about this.
RICO gives federal jurisdiction over cases of interstate entities committing obstruction of justice.
"If two or more persons conspire either to commit any offense against the United States, or to defraud the United States, or any agency thereof in any manner or for any purpose, and one or more of such persons do any act to effect the object of the conspiracy, each shall be fined under this title or imprisoned not more than five years, or both."
If a law enforcement agency wants to catch child predators, it is entirely legitimate for them to make fake profiles of children and see who responds, and it's going to be a lot more productive than sending subpoenas to the creepiest-looking people in town saying "Are you a child predator Y/N".
It's not their right to operate where they are prohibited, and it's also not their right to feed people believed to be enforcing that prohibition false information to prevent themselves from being busted for violating that prohibition.