When my last company got acquired, part of the due diligence process was a scan of our codebase for snippets from stack overflow. Every snippet found that wasn't posted with a clear license by the author was challenged and we rewrote it.

Now, I'm not entirely sure how necessary this was from a legal perspective. But introducing an AI into the mix will bring up a lot of uncertainty when it comes to how much change is required for something to no longer be considered a copy/derivative.