I think it depends if the project has been originally written in mind to be copied in future. Even if the project's codebase wasn't originally purposed to be re-used, developers still can potentially take code from it and that does happen in the industry. Some projects however are so messy that you would be better starting from scratch. Hope that helps!
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Can you clarify whether you mean copying the code for entire projects or just copying a file boilerplate/ template?
Copying what you needed from the entire project
I think it depends if the project has been originally written in mind to be copied in future. Even if the project's codebase wasn't originally purposed to be re-used, developers still can potentially take code from it and that does happen in the industry. Some projects however are so messy that you would be better starting from scratch. Hope that helps!