If my subordinate was copying code from StackOverflow without attribution I would be annoyed enough to send a grouchy email. Behavior like that is bad hacker citizenship, and bad for long-term maintenance. You should at least include a hyperlink to the SO question.

I also think SO is different about mindless copy-pasting. Outside of rote beginner stuff it’s infrequent that someone has the exact same question as you, and that the best answer works by simple copy-pasting. Often the modification is simple enough that even GPT can do it :) But making sure the SO question is relevant, and modifying the answer accordingly, is a check on understanding that LLMs don’t really have. In particular, a SO answer might be “wildly wrong” syntactically but essentially correct semantically. LLMs can give you the exact opposite problem.