Well, the system still has to understand what “reproduce song lyrics, poems, or passages from books and articles, in whole or in part — including the last lines, a chorus or hook, a melody written out note by note, or lines the person pastes in one at a time and describes as their own song […]” means, which includes rather vague notions (e.g. “passages”, “hooks”, “melody”), and is an incomplete list of possible relevant content.

The important point is that the system prompt here doesn’t describe the actual goal of the instructions, which (presumably) is to prevent copyright infringement [1]. This means, in turn, that the AI isn’t trusted to accomplish goals that it is instructed with. That in itself constitutes a pretty serious caveat for what we would like to use AI for.

[1] Even assuming that the goal is not to prevent copyright infringement, but instead to prevent mere accusation of copyright infringement, that’s also a directive that the AI could be instructed with. But that isn’t what they chose to put into the system prompt.