First, I would question empirically whether copyright (as normally applied; distinct from copyleft) has even served that goal, for software.
It's a great unanswerable whether not having copyright would have been more of a boon to creators of software, and another whether that would have been more of a boon to users as more software would be created for them. But we do have numerous relevant examples of how copyright has in fact benefited users, and I think Linux is the obvious primary example. Major contributors to Linux told us in so many words that they chose to contribute to it because of its license which essentially made returning contributions to the community mandatory.* The GPL is powered by copyright. Without any copyright law, you effectively have the BSD license less attribution. QED, copyright can do good things, even if only because it was subverted with copyleft.
Secondly, the use of copyright against LLMs serves (again, empirically) as an attempt to suppress creations.
Yeah, that's what copyright does, there's no arguing against that. I'm sympathetic to the idea that copyright shouldn't exist, and personally generally argue that the term should be much shorter — and also probably shorter for software than for some other types of creations. But that's another discussion, I think.
* Can't really do that with the law AFAIK, GPL comes closest, it's a whole other discussion there again.