Breh this is horrible. This is why parents need to be involved in their kids lives and i dont mean feeding and provided room and board. Listen to their concerns and complaints. If someone of authority in their life like school or group is doing something to them you got to cut that shyt quickly.
I wouldn't be surprised if some of these perps are the parents/stepparents. I'm pretty sure that those are the most likely individuals when it comes to online sexual exploitation of very young children.
With the older kids it's usually Romeo/Loverboy schemes.