Every parent I know forbids Youtube, for obvious reasons. Even the content on the Kids service is utter crap (I know several who tried the service and dropped it.)
I do recommend The Kid Should See This though, a really good selection of curated videos.
https://www.statista.com/statistics/1251942/global-youtube-k...
You might find your child spending 2 hours a day on ddg.
https://www.statista.com/statistics/1301730/us-time-spent-ch...