Not to diminish the importance of the child abuse but the real problem seems to be "securities fraud" not child abuse, so I'm not sure why the title and the article bring up the child abuse as if it's the reason for the closure?
Unfortunately from a ex-LEO perspective, it has been very popular with children and heavily hunted by sex offenders, at least in the communities I served in. Doing digital forensics, almost every police officer in a child protection case would be asking "can we get the kik history off that phone?"
Not be cause they were guessing but based on experience or admissions by the victim.
Part of the seedy underbelly that 75% of the community don't get exposed to.
People found it hard to believe when these sort of network-related offences occurred in churches too. Some religious groups are/were more prone to it than others, often based on opportunity or expectations.