Why Don't Adults Have Control Of Their Childs Profile Picture?

If you want to have a feature like this, then please post on the Xbox ideas page here on the Xbox insiders subreddit.

https://www.reddit.com/r/xboxinsiders/wiki/xboxrequests

Your own custom picture in profile is only for adult account. You are child, your parents made for you child account.

This is why you have parental controls

Is he on a child account or adult

If Adult then remove his privileges and put him on a child account

Game.currency isnt usually refundable if it is consumed

Changing the birthdate under your profile doesn't changes your child account to adult.

Only the parental account can upgrade a child account when the service registers that the account has reached 18+

Unluckily only adult accounts can post custom profile pictures for obvious reasons

From my knowledge, an adult account cannot make a child account have a profile picture. Meaning the account you wanna change the profile pic of will have to wait till the account is deemed an adult account (What that means is is that the birthday on the
account reaches 18 years old).