The problem with both Dropbox and Evernote is that their minimum pricing tier is too expensive for what they provide - particularly when both functions are provided as part of the Microsoft Office package with is the same price as Dropbox alone. I used both for years and would have happily paid a couple of dollars a month as I do for the basic tier of Google Drive. I abandoned both when the 2 device limit came in.
This. Office 365 package provides full office suit + 1TB of storage + 50GB ad-free mail box for the same price and they are already profitable at this price tag. If you are an startup offering any service more expensive than office 365 you are doing something really wrong.
Well it's not so much that you're doing something wrong. It's that Office 365 has such a ridiculous market share so their developments costs make up almost none of the price. Any start up is almost inevitably going to find their first development costs push their price up so they've really got to offer something new.