Snapchat launches SnapKidz
blog.snapchat.com
blog.snapchat.com
Further, it takes a village to raise a child, and the "parental guidance" ruse that always appears is aggravating and unreasonable. Outside of cults and specific subcultures, children exist and engage in the general world with people who might have different opinions. And that's where laws (and companies proactively doing things before laws appear forcing them) come into play.
When I was 12 I found a hack in eBay's system that allowed me to sign up using my mom's information then switch all the account information over to mine. Technology can be a democratizing force for kids, and "that ambitious kid" can rub shoulders with grownups without being patronized to.
On the Internet nobody knows you're a dog... or a 12-year-old.