I think this is what people are talking about? RE: https://news.ycombinator.com/item?id=38684252

https://help.dropbox.com/view-edit/privacy-settings-dropbox-...

> “For eligible accounts, […] The Third-party AI toggle is turned on”

I just logged in and checked and don't have the "Third-Party AI features" tab, but I only have an old free account and am probably not at the tier where this appears.