And the other aspect of Dropbox is their ‘sharing’ facility. For example, if you have a pic (or a folder of pics) that you want to share with friends or family, you can easily get a web address -
https://www.dropbox.com/s/j88oo9pfp2t98c2/red%20rose2.jpg?dl=0
which you can send to the world.
You can’t do that on iCloud (not sure about GMail’s sharing.
A
(PS when you click that link, Dropbox might try and wangle you into signing in/up. Don’t. Just keep saying ‘No’ till you see the line saying ‘continue to website’ and click that!)