A big problem with automatic demonetization is that what frequently happens is that (let's assume that you are a popular Youtuber):
You spend a lot of time and money to make a video.
You upload it to youtube.
It trips some random check and is flagged and de-monetized, you appeal.
People come and watch your video, with this type of content the vast majority of views is in the few first days since publishing.
Your appeal finally gets through, you can now monetize the video. However it is too late because 80% of the views the video will ever have have been without ads.
You are not entitled to revenue, however if you make your living off Youtube, you may expect that it will not randomly shoot you in the foot for no reason.