I used to be a creator (YT) in 2011 (channel created in 2011), granted I was young and inexperienced, I used certain copyrighted music / images initially and those particular videos were de-monetized. I feel my account was "flagged" internally for the lack of better word.

But then, I learned of how to give credits and all, but once you are "marked" there's very little chance that you may get monetized (at least used to be that way, haven't checked now). Also, by default, your videos would be marked as "Has copyrighted contents" which might not always be true.

The biggest pain point comes when you have to argue with the system / support. There were 2 videos where I did not use copyrighted material and credited royalty free track as per the requirement but there's no winning over them(even with facts).

For an organization as big as the Big G, this automated system and lack of actual checks until someone with big following tweets at them is sad to see even in 2021.