copyright etc has been dead the moment the personal computer arrived. we are still living through the chaos of the new world being born, but I think it has been over for a while already.
I would be very surprised if any kind of license like the GPL (or any license for published code) is left in 100 years or so.
DRM is another face of the same struggle, and this too shall pass. Ironically, DRM coming from the same source as the GPL (wanting to force rules onto something freely copyable), is viewed very harshly, since it supposedly interferes with your "freedom". But in the end they are the same.
Both GPL and DRM come from the idealistic fantasy that non-scarce digital goods have any (market) value at all. AI is just the latest nail in this coffin.
That's the whole point and philosophy behind the GPL. That's why it's called "copyleft". It's about taking copyright law as it currently exists and using it subversively.
That subversion is key to GPL but it's not the point. The point is to get the code shared as widely as possible.
The person you're talking to is missing that point because they're starting at "freely copyable", while the actual default is that code is never published at all. GPL is compromise to push source code 90% of the way to "freely copyable" because the alternative is usually 0% copyable.