Not necessarily a “user of an app” but a user of this “suite of source code”.
It turns out that most people who say that value free market capitalism never really did.
No one benefits from locking up 99.999% of all source code, including most of Microsoft's proprietary code and all GPL code.
No one.
When it comes to AI, the only foreseeable outcome to copyright maximalism is that humans will have to waste their time writing the same old shit, over and over, forever less one day [1], because muh copyright!!!1!
1: https://en.wikipedia.org/wiki/Copyright_Term_Extension_Act
Nahh, AI companies had plenty of money to pay for access they simply chose not to.
YouTube on the other hand has permission from everyone uploading videos to make derivative works barring some specific deal with a movie studio etc.
Now there’s a few exceptions like large GPL works but again diminishing returns here, you don’t need to train on literally everything.