'De-Monetized' suggests that someone who produces a video has an automatic right to income. That's bonkers, it's already quite a service that Youtube allows you to upload your videos to reach an audience that you'd be hard pressed to serve from your own server. They do this for free. In the previous iteration of such platforms all the ad income would go to the owner of the website, not to the rights owners of the vid…
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.