Of course those anarcho-capitalits among us who do not recognize “copyright” as natural because it is an attempt to limit what someone else can do with their knowledge and information is not “scarce” as each new copy does not diminish the original owners property. So you cannot copyright code any more than music or anything else. Once you share an idea with someone else it is in their head and there is no taking it back nor telling them what they can do. Copyright does not exist without the state and is ARBITRARY in its duration.
Conclusion, copyright and licenses only matter to statists. It is a “monopoly” that is maintained by force vs free competition.
If you want a “competitive advantage” never release the code. If you release the code, you have no right to use force to prevent others from using, distributing, or creating derivative works from it.