In contrast, the weights are the preferred form for modification, even for the company that built it. They only very rarely start a brand new training run from scratch, and when they do so it's not to modify the existing work, it's to make a brand new work that builds on what they learned from the previous model.
If the company makes the form of the work that they themselves use as the primary artifact freely available, I'm not sure why we wouldn't call the work open.
