Remember, Creative Commons licenses often require attribution if you use the work in a derivative product, and sometimes require ShareAlike. Without these things, there would be basically no protection from a large firm copying a work and calling it their own.
Rolling pack copyright protection in these areas will enable large companies with traditional copyright systems to wholesale take over open source projects, to the detriment of everyone. Closed source software isn't going to be available to AI scrapers, so this only really affects open source projects and open data, exactly the sort of people who should have more protection.