Quake's square root function wasn't the only, or the largest, example of code Copilot reproduces verbatim. Among others I've seen to date is someone generating a real "About" page with PII information of some random software developer.

How much code is enough to infringe is a tricky question, though. It's not only a function of size, but also of importance/uniqueness - and we know that Copilot doesn't understand these concepts.