So far in the last hour YouTube has purged Idubbbz, KEEMSTAR, MrRepzion, Conan OBrien, Miley Cyrus and Papa Jake
This is most likely due to YouTube's new policy changes towards "Elsagate" which I covered here 5 months ago. To those that dont know what that is is its kids video with adult themes/fetishes hidden in them. So most likey this may be rogue AI having to adjust to these new changes for safer content and attacked these channels though we will see.
https://youtube.googleblog.com/2017/11/5-ways-were-toughening-our-approach-to.html
https://www.usatoday.com/story/tech/talkingtech/2017/11/22/youtube-kids-programming/891024001/
http://mashable.com/2017/11/22/youtube-kids-update-protect-violent-videos/#3yy6EPPxwiqO
http://www.khq.com/story/36910913/disturbing-videos-appear-on-youtube-kids-app