> I'll be able to use the output of the model (that can't be prohibited)
If the model is copyrightable, they can prohibit you from running the model for a commercial purpose, even if they don't have copyright on the output.
If the model is copyrightable, they can prohibit you from running the model for a commercial purpose, even if they don't have copyright on the output.
If weights are copyrightable, then you need permission to copy them into computer memory/run them, just like any application.