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Almost guaranteed that anything you’re going to play that was produced in the last 100 years or so will be copyright protected.
https://www.pdinfo.com/mobile/
This is not unique to YT but since they’re large and with deep pockets they don’t want liability for their content and so monitor fairly heavily. In certain cases, as mentioned, the artists have people that do it themselves.
Copyright is no joke and the rights you lose by posting to YT are pretty big. I’ve tried to warn people about this in the past. Your music (even original music) is no longer your own and you’re at the whim of the platform. Of course most people never even look at the agreement or research a summary of what they’re signing off because it’s not as fun as posting and watching.