Yet I believe OpenAI isn't using data from Dropbox to train their models without users' consent.
BUT I don't think that's the problem here. The problem is data in transit; data sent to third parties who can actually read it, and who may have rogue employees that Dropbox has no control over; data that can appear in logs or subject to different policies, etc.
If I send private data to Dropbox they can't send it to anyone for any reason, including "improving" their product, without my explicit and informed consent. I'm not sure how this is even debatable.
If Dropbox wants to house models and offer RAG search themselves, to consenting users, that's one thing.
If Dropbox sends all data of all users to third parties without telling anyone before the fact, that's another thing. A terrible thing.