So basically we exploit children for sex in a world that is so uptight that sex work by adults is still controversial and not legal in many places. We have a world of adults so uptight about their own sexuality that victimizing the most defenseless among us is preferable to dealing with adults meeting their needs with other adults and sorting out questions of how to do that in a world where we no longer automatically know some small group well from which to bond with someone and marry them and etc and are still sorting out how to find a mate for life in this big wide world.
Corporations and parents and assorted others are all doing this. This doesn't mean Meta is off the hook for this but this is occurring in a larger context where we routinely just don't want to know kids are abused it seems.