Reaction to copyright infringement, fake news, or extreme content?
keyplyr, there's a fairly long chain back to an answer to your question.
engine's link at top of first post... changed the way Creators earned money on YouTube
[webmasterworld.com] ...goes to an Aug 9 WebmasterWorld post that links to this Google blog post, which was Google's overview of the problem as of that date... Expanding the ability to appeal more videos YouTube Creator Blog
Mon Aug 7, 2017
...which discusses why lots of Creators were unappy...
With new controls and guidelines implemented, many creators have seen their earnings return to normal as advertisers resumed their campaigns. As a part of these recent changes, however, some videos were classified as not suitable for all advertisers, limiting the number of ads served on those videos. There was also no ability to directly appeal in Video Manager. Over the next few weeks, we plan to roll out new icons that will give you a more detailed understanding of how each and every video on your channel (or channels) is monetizing as well as the ability to appeal if you think a video is misclassified.
Both on the product forum linked to above, and in the Aug 7 Google blog post, there's a link to this Help article, which then has a long list of guidelines, covering pretty most types of subject matter you'd expect advertisers to try to avoid... Advertiser-friendly content guidelines YouTube Help
Oct 11, 2017
Includes, to name a very few... Controversial issues and sensitive events, Drugs and dangerous products for sale, dangerous acts, pranks, hateful content, smutty satire, strong sex or violence, etc.
Creators' reactions (creators running the channels) included misclassification, lack of appeals, transparency, etc. Not sure how the number of views vs size of channel was resolved. Copyright is one of the issues mentioned in the Oct 11 blog post for banning an ad. Not clear whether this was an issue among the unhappy creators on the forum thread.
[edited by: Robert_Charlton at 10:26 am (utc) on Nov 15, 2017]