Some of them are but not all of them are, some of them are having their cheese redistributed without their involvement. The ones who are complaining are the ones who aren't happy, such as the musician quoted in the testimonials saying "fuck everything about this.'

Isn't that literally 'shooting the messenger'?

You can Google search for pirated music too. It's not 'Fuck Google' for indexing these, its 'Fuck those sites' for hosting it, right?