Copyright only covers the expressive parts and not the utilitarian parts.

Here is some reading material for those of you who disagree with reality:

https://en.wikipedia.org/wiki/Abstraction-Filtration-Compari...

https://en.wikipedia.org/wiki/Idea–expression_distinction

https://h2o.law.harvard.edu/cases/5004

https://www.loeb.com/en/insights/publications/2020/04/johann...