As a loyal Dropbox Plus subscriber I never, ever realized this until you posted it. Office 365 all of a sudden sounds incredibly enticing. It'll no more per month for me and yet I'll have the always up-to-date Office suite on all of my devices. Thanks for the epiphany!
I used Dropbox for YEARS until this. Office 365 is great. My mother in law, my wife, myself and all of our devices all get Office + each one of our own Outlook accounts has 1TB of storage. OneDrive has REALLY matured over the last few years. The Online collaboration features are on par with Google - we use it at work now. Been an Office 365 subscriber for years now.