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Description
CC0 is not recommended for software projects and mixing CC0-licensed content with MIT or other software licenses is not ideal because of the different treatment of patent grants. The MIT license contains an implicit patent grant and the CC0‑1.0 license excludes a patent grant (read more, e.g. here).
Since the generated project is under a software license, it does not make sense to use CC0 for the template. Instead the most liberal software license should be used (MIT) or the Unlicense. If MIT is used the Unlicense cannot be offered as possible license in the project setup questions.