I never claimed that this is 1 on 1 replacement for Dropbox. Dropbox is much much much more than what I am doing here. And I agree with you on that point. I choose DO because it is very easy to set up and get started with.
But for my needs this is all that I need and it solves my use case.
And regarding DO, its just one of the possible S3 providers out there. One could choose something else.
Whole thing just looks like poor ad for DigitalOcean