> it shouldn't take Apple/Microsoft/Google/Amazon too much work to put out a comparable product and offer it for free.

OneDrive is perhaps not quite as polished and its Linux support is lacking/unofficial/nonexistent depending on your viewpoint, but Microsoft's push to Office365 means that if you subscribe to it you're getting at least as much storage as Dropbox offers at a monthly cost that's ~70% of Dropbox for a single user, or 5x that (5 * 1TB/user) at the same annual price as Dropbox. On top of that, you get the assorted Office apps.

One notable weakness of the non-Business version of OneDrive is the lack of version history, so if that's important or you have no other forms of backup then that could be a deciding factor.

I'll leave out of it the question of whose servers data resides on and passes through.