It’s an agreement between a public company and a highly scrutinized private company. Several of the provisions will change what happens in the marketplace, which everyone will see.

I imagine the thinking was that it’s better to just post it clearly than to have rumors and leaks and speculations that could hurt both companies (“should I risk using GCP for OpenAI models when it’s obviously against the MS / OpenAI agreement?”).

Also it's about OpenAI going public.