I too believe that AI work should be public domain by default.
If there were a machine on the street corner where pushed a button and a macguffin popped out, you don't deserve credit for the macguffin.
If you entered parameters into the machine on the street corner and pushed a button to pop out a custom macguffin, you may be able to argue that you deserve credit for the parameters, but not the macguffin itself AND FURTHERMORE if anyone else wrote custom parameters that happened to produce an identical macguffin without ever having read your parameters, they have exactly as much right to gatekeep it. which is to say basically none.