It appears DailyMail.co.uk's official YouTube account was terminated today for "violating YouTube's Community Guidelines."
Here is a link to their YT account so you can check for yourself:
https://www.youtube.com/user/MailOnlineVideo
After searching for some of their recent videos, the below screenshot appears to show the account does in fact belong to Daily Mail (notice the verified checkmark):
Coincidentally enough, they recently posted an article about YouTube's crackdown on conspiracy-type videos:
http://www.dailymail.co.uk/wires/ap/article-5501453/YouTube-tries-crack-conspiracy-videos.html
Were THEY one of the victims of this crackdown?
Read more below: