Yes, it makes sense that private messaging should not be available at all for child accounts. Thank you for clarifying and I appreciate your help with this.
One final comment though. The way the Private Messaging option is currently written, it seems to imply that if the selection is “OFF” you will be able to receive direct messages from everyone, not just those that you follow. Sounds like there is different logic applied under the covers for a child account vs. adult account for Private Messaging as a whole though. To better communicate this to the user, perhaps a higher level selection is needed to toggle Private Messaging capability on/off, with the current option nested below that and only selectable if PM is “ON”? Adult accounts would then be able to turn PM fully off if desired, the UI would continue to be the same experience for child and adult accounts, and the adult user would have better control of PM preferences.