I don’t know what your sources are, but I work on AI at a Fortune 100 and open models now make up >90% of our internal token spend. Used to be 100% closed before this summer.
Not a tech company though, so maybe that differs and we’re just behind what’s en vogue. However we did get in on everything pretty early, building our ChatGPT RAG clone right about when azure got gpt-3.5-turbo on api