Coppa is so easy to solve heres three extra options youtube could've chosen (there are more)

Make kids settings account age based and assume anyone without an account is a kid; Have teams investigate videos that contain bright colours, animals and music instead of automatically assuming this makes it for kids; Make more age groups I.E 0-5, 5-8 8-10 10-13 13+; Have 3 options, Made for kids not made for kids and made for adults. keep demonetising people who post edgy non family friendly content. Force videos to effect all users regardless of their age or account and have bots automatically decide whether or not something is made for kids so you have dhmis recommended alongside Peppa pig; YOUTUBE