Real reason for Youtube purge?

Several conspiracy channels have been deleted from Youtube. There is no transparency about why, except the claim that it happened due to broken rules.
But the fact that several of these channels were banned on the same day, indicates a new procedure beyond merely enforcing the site’s rules.
Did something recent provoke the higher-ups at Youtube/Google…. seems like something that would happen after a Tom Delonge tweet LOL but it seems they got the hammer on a quiet day?… someone confirm?
David Seaman
Destroying the Illusion
h/t AC01314150