But games like Quake are not "open source". They have been open-sourced, specifically the executable parts were, without the assets. This is usually spelled out clearly as the process happen.

In terms of functional role, if we're to compare the models to open-sourced games, then all that's been open-sourced is the trivial[0] bit of code that does the inference.

Maybe a more adequate comparison would be a SoC running a Linux kernel with a big NVidia or Qualcomm binary blob in the middle of it? Sure, the Linux kernel is open source, but we wouldn't call the SoC "open source", because all that makes it what it is (software-side) is hidden in a proprietary binary.

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[0] - In the sense that there's not much of it, and it's possible to reproduce from papers.