Who actually uses these products,
and what made them stay.

The Dropbox Cross-Functional File Sharer

A project manager, creative director, or department lead at a company that produces large files — design assets, video, documents, presentations — that need to move between internal teams and external partners. They use Dropbox because it works for people who aren't on their company's Google or Microsoft stack. It's the lowest-friction way to get a 2GB folder to a client or vendor who uses a PC, a Mac, or a Linux box, and doesn't have access to their internal SharePoint.

“A client has requested all source files from a project completed eight months ago.”