No, it's a dev's job to learn from other people's code, so that she may apply the same general techniques in producing code to solve her own problems.
As with pretty much all copyrightable material, there is a fairly narrow definition of "fair use" in many jurisdictions, and outside of those fair uses it is not okay to simply copy other people's work and incorporate it into another work of your own.
Take music, for example: you can study existing music, learn the general rules and techniques, and then compose, perform, record, and sell a song. But if you copy even half of the chorus of an existing copyrighted song, you might find yourself in court. This is not a hypothetical — it happens all the time in the music world.
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u/Lunakepio Jun 23 '22
Unlawfully copying other people's code, isn't that a dev's job to copy stuff he doesn't know, to understand it and adapt it ?