I think it comes down to how often you use the platform. YouTube has been my primary media source for the last twelve years and ads are what paid for that. Now that I can pay $14 (USD) per month to give the people I watch a bit more, have no ads, downloads, and a few other nice little features, it was a no brainer for me. I have always gotten _way_ more mileage out of YouTube than HBO or Netflix.
But if you don't, then it's probably not worth it and having an advertisement will pay for it instead.
YouTube Premium is $19/mo
It's much cheaper in developing countries
in the US, going through the official website, it shows $14 a month or $11.66 a month if paying for the upcoming year at once. Premium and Music are part of the same product here and I'm not sure if you can unbundle.
For comparison, Spotify Premium here looks to be $11/mo.
At the same time I can't shake the feeling that Google just enshitified the experience so much, that now "it's logical" to take a sub to make it decent again.