Literally irrelevant and I have no idea why people even bring this up constantly. Copyright is practically unenforceable in the software world, when was the last time you saw someone (a company or an individual) actually sue _and win_? Apple wasn't capable of stopping all the other phone manufacturers from directly cloning their product (despite having patents & copyright) so how can an individual? The only thing that matters is execution.
For instance, my repos are cloned like ~100/week by what I presume are bots and AI lab scrapers using them for training material. How am I supposed to even find out who's doing it, and if they're abiding by the licenses I provided? It's impossible.
Lastly, having copyright isn't the same thing as being allowed to commercialize the software (and I believe loads of people confuse the two). You can still sell public domain code, even if you don't have copyright over it.