How unsurprising, a headline that technically doesn't lie, but also gives a completely misleading impression. At least it has been fixed since: the current, accurate one is "Dropbox spooks users with new AI features that send data to OpenAI when used"

Because your files only get sent to the AI search service if you use the AI search feature, which it tells you will send the one specific file you are asking the AI to analyze to OpenAi. Which, you know... Duh?

The third-party AI toggle is only turned on to give all eligible customers the opportunity to view our new AI features and functionality, like Dropbox AI. It does not enable customers to use these features without notice. Any features that use third-party AI offer disclosure of third-party use, and link to settings that they can manage. Only after a customer sees the third-party AI transparency banner and chooses to proceed with asking a question about a file, will that file be sent to a third-party to generate answers. Our customers are still in control of when and how they use these features