This is a mistaken take driven by corporations. Artists and creators generally don't own their own copyrights. It's the first thing they're forced to sign away to get any kind of contract, publishing deal, or other form of access from the big players who hold the keys to the kingdom. Nobody is making even a million dollars let alone more without going through them, and they don't agree unless they own those rights.
Small time creators can own their own work, but even then you have countless examples of creators who wouldn't play ball so the bigger companies just plagiarized them and they don't have the money to fight it. You need the backing of a big company to even enforce your claim against the other big companies that threaten it if it's actually lucrative. And, again, they won't unless they're the ones that own it because you signed it away.
Copyright does not protect creators in the slightest. It's a tool by and for large business used to legally steal from creators.
I'm in this boat now. After years of the wrong diagnoses, I'm finally figuring out it's been ADHD this whole time. But I keep running into issues getting a proper diagnosis and treatment. The last guy decided it was depression after one meeting with zero tests and it's just so frustrating. If he actually knew anything, he'd know it's more complicated than that. He also didn't listen at all.