There's a difference. Open AI essentially has 2 products. The chat bot $20 a month thing for Joe shmoe which they admit to training on your prompts, and the API for businesses. Workspace is like the latter. The former is closer to Google search.

Sure, but there is no ambiguity about that, is there? You know that, because they tell you (and, sure, maybe they only tell you, because they have to, by law – but they do and you know)

How do we get from there to "just assume every company in the world will sell your data in wildly and obviously illegal ways", I don't know.

Well..that does seem to be the default. If they don't explicitly say they won't, they probably will. It's a sad world.