Definitely keep it. I enjoy it when yt's autoplay random walks me onto older and more obscure music. While I've been listening to AP for years, this has happened with other groups.
I'm gonna have to go listen to Trust in Trance now, such a classic.
I considered deleting the videos, because of clear copyright violation, but I feel it's a bit of history that might get lost. Also, because of copyright claim, the producers are still getting ad revenue.