In my experiences, BEFORE an ad is placed on your YouTube video, you have to check off a box, indicating that you want your piece 'monetized'. I never have, and my pieces have no ads. However, if you DO check the box, and the ad appears, you are supposed to get a tiny fee. I've heard as little(or much) as $6000 per million hits. However anyone may look into the figures(they may change).

When I gave a CD, to a hospital, (that hospital is in the top 1%, of top cardio hospitals in the nation), because the cardiologist said, "I heard your music on YouTube, and boy, there is a LOT of healing in that music", On my return visit to the hospital, five weeks later, I gave the hospital and the cardiologist a small stack of CD's, with permission to use, copy and distribute the music, as much as they'd want, for the use of healing...with no residual or licensing fees coming to me. I told them, "If this music heals people, or even helps in healing people, just take it, and use it. It is a gift from God...."
At last check, it is being used, for cardio and psych, in six hospitals in four states!

I know that the money is nice to have, and to be compensated for all the time,(lots of it) in working the craft...but then there are other priorities.....and as far as 'profit'...it all depends on how you count 'profit'.....and you don't even need a political ideology, to 'take it from you' and re-distribute it......but then, that's a different story....

GfS