I'm also curious, specifically about the cost of training vs inference, and comparing that to other industries that can have high R&D costs. My instinct says that open weights aren't feasible because of the obvious issue where there is no incentive to develop your own model rather than just taking someone else's model. However, I could see a scenario where a hardware company designs a model that is open weights but optimized strongly for their own proprietary hardware, cutting their costs of inference low enough to be competitive with a hypothetical other company that doesn't have any R&D expediture.