There is a well settled practice in computing that you just don't plagiarize code. Even a small snippet. Even if copyright law would consider such a small thing "fair use".
I think way many developers use StackOverflow suggests otherwise.
They redistribute the material under the CC BY-SA 4.0 license. https://creativecommons.org/licenses/by-sa/4.0/
This allows visitors to use the material, with attribution. One can, of course, use the ideas in a SO answer to develop one's own solution.
I just checked, though, and the code base I'm now working with has eight stackoverflow links. Not all are even written by me, according to quick check with git blame and git log -S..
Which Stack Overflow cannot verify. It might be pulled from a code base, or generated by AI (I would bet a lot is now).
My comment didn't say anything about the output of AI being fair use or not, rather that fair use (no matter where you are getting material from) ipso facto doesn't mean that copy paste is considered okay.
Every employer I ever had discouraged copy and paste from anywhere as a blanket rule.
At least, that had been the norm, before the LLM takeover. Obviously, organizations that use AI now for writing code are plagiarizing left and right.
In addition to the Structure, Sequence and Organization claims, the original filing included a claim for copyright violation on 9 identical lines of code in rangeCheck(). This claim was dropped after the judge asked Oracle to reduce the number of claims, which forced Oracle to pare down to their strongest claims.