Let me explain it to you in another way:
Youtube is the platform that allows almost ALL type of content, pretty much everything you want to upload to the platform, movies, series, vlogs, documentaries, teaching stuff, anime, etc etc you just need to FOLLOW their rules and guidelines, pretty simple. They just want you to share stuff.
Adsense is the platform where you can monetise primarily your website, blogs and youtube. You need to FOLLOW the rules and guidelines to MONETISE stuff.. Yes,, you can show naked bodies on YT, it's totally fine but that doesn't mean you can MONETISE that content. See the difference now? is NOT YT's decision. If the companies who paid for ADS don't want to show their ads in those type of videos... well,,, it's their money and YT/Adsense need to respect that.
The problem is not YouTube and is not Adsense... problem comes from the companies who helped YT/Adsense write those rules and guidelines and YT tries to make everyone happy.
In the end I don't think they will become poor because people are deleting their channels... They are cleaning their platform from Adsense and enforcing people to upload original content, you have the right to upload your videos if you want but YT/Adsense doesn't have the obligation to pay you for that content because Advertisers don't want their Ads placed there.
Is pretty simple to understand IMO and after a couple of years... if people want to monetise their videos, they will read and follow the rules they need to! and if the only thing people want is to monetise their content... they better hurry up and create something original because rules might change in the next couple of years and those rules will be more and more strict each time!