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More than a quarter of new code at Google is generated by AI.
(www.theverge.com)
This is a most excellent place for technology news and articles.
Reusable code is usually pulled out into a library and reused that way, rather than copied and pasted into a new project. You might copy and paste some boilerplate to new projects but it wouldn't be anywhere near 25% of the code.
I'm not sure why someone downvoted you (it wasn't me!) because your comment did seem like a genuine question.