I got a new wrinkle from Youtube. I posted a version of "Hamburg" a tune for "When I survey the wondrous cross" which was written in the 1700's. Knowing it was my own arrangement of a public domain tune, I enabled "revenue sharing" (not that they've shared any yet with me).
After two views, I got an email notice from Youtube saying "We have disabled monetization on the following videos because we were not able to verify that you have the appropriate commercial use rights for all included content." They did provide a link to respond, which I did, and 3 days later the tune remains "disabled for revenue sharing." It's not that I care about the revenue sharing, but I do care about the frontier style claim jumping that's going on with public domain materials...