GWMT - "Tag Site For Child Directed Treatment" Effect On Search / Rankings?

[SearchMarketers]

Hi All,

We have a client who has been directed to tag their site for "Child Directed Treatment" in Webmaster tools to comply with AdExchange policies. The site is, generally speaking, directed at those between the ages of 13 and 16 along with their parents, but does NOT collect any data (No sign in, login, signups etc).

You can find out more about the specific tag here (unfortunately not much more about it) https://support.google.com/webmasters/answer/3221080?hl=en

Our concern is that we have never heard of this specific tag, and our client is asking us to let them know if that this will have no effect on search traffic or ranking. I can't find much in the way of anyone who HAS implemented this tag and the effects it has had on their site. They are ad supported, receive millions of unique hits a month, and the majority of their traffic is from branded keywords.

Would love to hear from anyone with ANY experience or thoughts on this process and what to be aware of.

Your assistance is muchly appreciated.