I think you hinted in your question that there are various levels in which YouTube videos are affected by a violation of our community guidelines. In some cases they're demonetized so you can't make advertising revenue from them. In other cases, they're rendered private so you can continue to share them but they're not surfaced in the search. Finally, there's a takedown. They receive notification by email that there's been a violation of the community guidelines and there's an opportunity to explain why that should be reversed.
On May 21st, 2020. See this statement in context.