Google says it took down multiple coordinated influence operations linked to China, Russia, Iran, and Tunisia. The disinformation campaigns were also identified using leads coming from researchers from other companies including Graphika and FireEye. In all, Google says that it banned 2,596 YouTube channels used in coordinated influence ops coordinated by Chinese actors, 86 YouTube channels linked to Russian disinformation campaigns, and 19 channels involved in Iranian influence ops. The Russian-linked influence operations were focused on distributing content focused on domestic Russian and international politics and policy issues.
Source: https://www.bleepingcomputer.com/news/google/google-banned-2500-chinese-youtube-channels-for-disinformation/