Original analysis of public data is not stealing. If it were stealing to do so, it would gut fair use, and hand corporations a monopoly of a public technology. They already have their own datasets, and the money to buy licenses for more. Regular consumers, who could have had access to a corporate-independent tool for creativity and social mobility, would instead be left worse off with fewer rights than where they started.
I can reaffirm what they said with slightly more proof.
https://huggingface.co/spaces/lmsys/chatbot-arena-leaderboard