The music IS copyrighted. That's how they were able to identify it from their copyright database. Your right to use it, with or without attribution, with or without royalties, and for which uses, is part of licensing. If you have any ads displayed on your channel, for which you might conceivably receive money, it's no longer "personal use", it's "commercial use". It's why you have to be so careful with intro/outro music for podcasts. They default to being commercial use.