No? The code for the model can be open-source - and that's pretty valuable. The training data can be made openly available too - and that's perhaps even more valuable. And the post-training weights for the model can be made open too.

Each of those things is very meaningful and useful. If those things are open, then the AI can be used and adjusted for different contexts. It can be run offline; it can be retrained or tweaked. It can be embedded into other software. etc. It is definitely meaningful to open source that stuff.