I'm not on YouTube, but 've seen the same happening with one of my reviews on Google Maps. I rarely use it - maybe that's why if I do leave a review, Google keeps bugging me with notification about how much my neighbours life became because of my review.
When I left a comment about a club that is a meeting point for the local neo-nazi-scene because it is a meeting point for the local neo-nazi-scene, I've never received any of these Google notifications.
Since I don't accept any cookies from Google on my desktop I watched out for my review - and they obviously simply hide it from anyone else but me.