The Anthropic open weights response letter is so slimy. "We have never advocated for a ban on open-weights models, we just want mandatory safety testing!" But they know they'll always be able to de-facto ban open weights using this very "safety" testing.
It has been a privilege and a blast to contribute to this effort! It's really the best to be able to see all the incredible things people are already doing with River, and make those things better