That’s the reason we got copyright, but I don’t think that’s the only reason we could want copyright.
Two good reasons to want copyright:
Accurate attribution
Faithful reproduction
Accurate attribution:
Open source thrives on the notion that: if there’s a new problem to be solved, and it requires a new way of thinking to solve it, someone will start a project whose goal is not just to build new tools to solve the problem but also to attract other people who want to think about the problem together.
If anyone can take the codebase and pretend to be the original author, that will splinter the conversation and degrade the ability of everyone to find each other and collaborate.
In the past, this was pretty much impossible because you could check a search engine or social media to find the truth. But with enshittification and bots at every turn, that looks less and less guaranteed.
Faithful reproduction:
If I write a book and make some controversial claims, yet it still provokes a lot of interest, people might be inclined to publish slightly different versions to advance their own opinions.
Maybe a version where I seem to be making an abhorrent argument, in an effort to mitigate my influence. Maybe a version where I make an argument that the rogue publisher finds more palatable, to use my popularity to boost their own arguments.
This actually happened during the early days of publishing, by the way! It’s part of the reason we got copyright in the first place.
And again, it seems like this would be impossible to get away with now, buuut… I’m not so sure anymore.
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Personally:
I favor piracy in the sense that I think everyone has a right to witness culture even if they can’t afford the price of admission.
And I favor remixing because the cultural conversation should be an active read-write two-way street, no just passive consumption.
But I also favor some form of licensing, because I think we have a duty to respect the integrity of the work and the voice of the creator.
I think AI training is very different from piracy. I’ve never downloaded a mega pack of songs and said to my friends “Listen to what I made!” I think anyone who compares OpenAI to pirates (favorably) is unwittingly helping the next set of feudal tech lords build a wall around the entirety of human creativity, and they won’t realize their mistake until the real toll booths open up.