Artists are not the only ones who make a stink about this; it's inherent to the capitalist mode of production. Everyone involved in a venture is risking something, but the law only rewards specific kinds of risk with equity ownership over the venture. Other kinds of risk are solely rewarded with monetary wages at sub-profit margins. That's why labor unions exist, and why the nation's elites work tirelessly to stop them.
But with artists, there's a particular extra wrinkle, in that the law created a middle tier of reward specifically for the efforts of creative workers. Copyright was specifically intended to allow authors to have their own business ventures without necessarily having to share in the same risks that equity owners do. So, naturally, those equity owners all colluded with one another to steal this other form of equity and wear it as a second shell.
But with artists, there's a particular extra wrinkle, in that the law created a middle tier of reward specifically for the efforts of creative workers. Copyright was specifically intended to allow authors to have their own business ventures without necessarily having to share in the same risks that equity owners do. So, naturally, those equity owners all colluded with one another to steal this other form of equity and wear it as a second shell.