I'd imagine just keeping the videos on YouTube still brings some 6 figures per year of income to someone so no point in deleting those.
Can confirm. I helped run one of the largest flash animation networks in the early 2000's (FlowGo), and after we uploaded the content to YouTube after we shuttered the business it was a very nice passive stream of revenue from over 5 billion impressions between 2008-2014.
That's "terminated". This is "sunsetting".
I think that's kind of a cynical take on what shutdowns can look like.