A few days ago, YouTube's content creators channel put out a video explaining their overarching policy about how they see bad actors on their platform and how they see their role in handling them.
Essentially what the video says is that YouTube has a responsibility to protect the brand, advertisers, and other content creators, so they reserve the right to take action against content that they see as harmful, even if it doesn't explicitly break the rules.
I guess you could call this a "policy to fill the gaps", where even if someone comes along with a completely unforeseen way to damage the community, they can still take action against them.
Do you feel thi