Do you think companies do not hide secrets? I think you are wrong but maybe I do not understand your point of view. However let's see my example.

Imagine: you are a boss of a company and own a powerful tool which can give you a lot of advantages. In short: it allows you to earn more money than competing companies. Would you share this tool to everybody, so that means competing companies could destroy your business or you keep the tool in secret and slowly build empire?

I do not know if OpenAI has powerful LLMs/AI things but I can be sure they do not share everything what they have. I think the only way they could share hidden "powerful tool" is situation where men in black visit CEO and talk with him/her about co-op. Of course CEO is "happy" because he/she can not refuse if you know what I mean. But still hidden powerful tool is hidden but this time another "more important guys" have access to it.