However, some people may not want to pay this fee because they only listen to songs on YouTube Music occasionally, and if they can't download the music, they can accept listening online. It means that you need to pay $9.99 per month to be its member.
But technicality, it does not support you to download songs from YouTube Music directly unless you are a YouTube Music Premium subscriber. You may want to get YouTube Music free download for local listening or to send it to different devices.