> but the reality is that these model are expensive to develop and many developers are choosing not to release their model weights at all.

But isn't that true for software too? Software is expensive to develop, and lots of developers/companies are choosing not to make their code public for free. Does that mean you also feel like it would be OK to call software "open source" although it doesn't allow usage for any purpose? That would then lead to more "open source" software being released, at least for individuals and researchers?