Dropbox is in a weird place right now because its free tier is too small, the pair tier is too big and expensive, a $5 tier doesn't work financially, and Google, Microsoft, and Apple offer 80% as good solutions with 2.5x as much space for free. For corporate customers, again, they're probably Exchange or GSuite shops, so they can use one of those storage providers.
Dropbox addresses a real problem, it's just that the triviality of a business copying it means it became table stakes on a lot of platforms.
Dropbox’s killer app is: simply working. I have access to and use both Google Drive and O365 One Drive at work and it is shocking how often I have problems with them.
To be clear, my expected rate of problems for this functionality is “never.” The only service I have that experience with is Dropbox. With GDrive and One Drive I have seen folders lose sync, files get stuck syncing, and inexplicable conflicts.
In addition, sharing outside my org is way easier and more reliable with Dropbox.
I agree that copying files around seems like it should be trivial. Somehow it’s not, though. I don’t have an explanation, just observations from trying to get real work done on a Mac.
Dropbox addresses a real problem, it's just that the triviality of a business copying it means it became table stakes on a lot of platforms.