For YouTube channel authors, a special warning has been issued for a large number of content creators, as documented below:

https://www.forbes.com/sites/daveywinder/2019/09/23/youtube-security-warning-issued-for-23-million-creators-as-massive-hack-attack-confirmed/

According to the ZDNet investigation, many accounts belonging to well-known YouTubers within the community have been hijacked.  Amongst those impacted by their YouTube accounts being hacked and access to their channels lost, were YouTubers covering technology, music, gaming and Disney. With more than 23 million YouTube channels, anyone who creates content should be heeding this warning though.  The investigation by Cimpanu points clearly towards a coordinated phishing campaign … this was likely a highly targeted, or “spear phishing,” campaign