If an AI "listened" to music and created new samples for musicians to use for a fee, do you not think the original musicians should be compensated?

The value transfer is basically theft.

It isn't about the usefulness of the service, or even that something similar is a good thing ... it is about the execution and what it says about fairness for those that worked to create the data it depends on to produce value.

You're welcome to use a "do whatever you want" license on your code, and people should respect that. (Though even those licenses tend to require attribution, and copilot doesn't do even that.)

Other people use licenses that try to create a commons where if you want to use it you need to share your own code, as a counterpoint to the non-commons in which you can't use code at all. And if people use those licenses, they should be respected as well.

By all means, eliminate copyright, and let all code be copied freely. And until that happens, as long as proprietary code exists and doesn't let anyone copy it, respect copyleft licenses as well.