Strange 2-3 hour long youtube ads where nothing happens

So the other day I was at my parent's house and they were using their smart TV to play youtube videos, every now and then an ad would play that it was 3 hours long and it was nothing but a camera on a tripod recording people working, in real time, no edits, no call to actions, no music, no voice over... it seems like some people experience these ads on their smart TVs only what could this be? also I'm new to this subreddit looking forward to what comes up