It's definitely said that copyright helps artists but I don't think it was ever, ever true. Copyright gave publishers a way to own music which artists made, and then take most of the profits.
If I buy patents from other people and then employ people to hunt for incursions on my patent rights... Behold, I'm a patent troll. If it's music, I'm a publisher. I'll take $10 from a fan and give pennies to the artist from that transaction. That doesn't help the artist who's signed up, and we have these strange huge entities dominating stores, charts, and radios who make it very difficult for independent artists ever to get a spot.
Anyone who loves recorded music loves musicians who have been famously, royally flipped over by their record company. We've got a few cute stories about big clashes beside just so much combined misery imposed on artists who were forced to be subject to publishers. The only leverage the company ever has is that they can own the stuff you made (even before you've imagined it!!) copyright.
Has an artist ever, ever praised copyright? No. Never. Barely any have even criticised piracy - even as it became normal and overhauled the landscape. YouTube must make $$$ each day from hosting music whilst not paying anyone to do so which is like white-collar piracy which doesn't involve the love of music. All this is fine, it's good the more people who can hear music.
(Denouncing piracy, that one time with Metallica, isn't the same as advocating copyright is good. As a musician, I think it's silly to pay anything for music, ever, if the big cannibal corps take 95% of the profits... That's really not supporting artists imo. Maybe there's a version of copyright which would be good and fair but we don't get nearer it by paying the not good, not fair system.)