Great idea, those "your video will play after 5,4,3 etc" are so annoying!
I think I did the same to my videos but I'm not convinced they got turned off. I don't see them when I watch but thought that's maybe because I'm signed in to Google ( don't get me started about that gripe). And figuring out how to turn them off was very complicated, on purpose?
Is my video clean of ads?
https://www.youtube.com/watch?v=m6qg6RMUyOc