Their price on 2TB for $9.99/month is competitive with Apple but we have 4 Macs, 5 iPads, and 5 iPhones. Much easier to have the Apple devices backing up to iCloud.
I did look at their Plus/Professional/Team offerings https://www.dropbox.com/plans and they do look useful for a lot of business cases.
By the way, they cut the number of devices that could access an account from unlimited to 3 on the free account. Fair enough but I was somebody who earned extra gigabytes in 250MB chunks for every person I referred to them.
Regarding USBs, Dropbox's messaging at the time was "throw out your USB drives", and this was before smartphones or ubiquitous dependable network connections. At the time, if I had to give a presentation in a university classroom, Dropbox wasn't moving the bar much on that particular problem.
Is your ego really that fragile that you can't admit you made a mistake judging a business?
https://finance.yahoo.com/chart/DBX#eyJpbnRlcnZhbCI6ImRheSIs...