I think new accounts are monitored a lot while old ones less, as well as old videos less or no monitored than new ones. In other words, if an old account with old video is there, it may keep there forever until some user reports it, which is unlikely for advertising issues - more likely for nudity... while new accounts and new posted videos are hard to pass as where youtube guys focus mostly.
I got some affiliates with youtube dancing girls video, which is there from 2011 with 10,000's views and still bringing signups. Now with recent google updates every search brings youtube videos in top and seeing big banking from those old vids still there.
Those I checked are sexy dances in bikini or sportswear with keywords such as skype messenger cam see me (no any nude or porn or sex keyword - more likely a cam messenger skype chatroulette or so), just they put affiliate redirector url overlay to video and/or direct link in comment under video which would be bannable.
Just it matters not to post such videos links in gfy or someone reports it to youtube instantly
