These API composers perform a task many humans want to do. And there are roughly zero consumers of music saying "you know what's missing from the music market? music made with no human input."
This strictly serves capital. The goal is to destroy more artists livelihood to marginally increase the wealth of already wealthy people.
By the same logic synthesizers shouldn't have been invented that allowed people to make advanced sounds without tediously learning an instrument first, consumers should remain priced out of microphones and editing software, etc.
Like I said, I am not trying to feign ignorance on the drawbacks of the tech which is very real and far from negligible. I am not a tech bro AI maximalist. I just do believe that hyperbole will not put the djinn back into the bottle, and pretending like there isn't a real market between nothing and paying or being a composer isn't adding anything to the conversation.