[varenc]

Dropbox mentions their real competition in S1 filing: Microsoft, Google, Amazon, Apple, and Box. None of them seem to offer E2E. The competitors you cited aren't worth mentioning due to their small market share relative to the big players.

E2E might be feature customers start demanding in the future, but it sure doesn't seem like that now.

(though I wonder how many folks are using the big players on top of other encryption solutions like truecrypt/veracrypt/safe, etc)

[jest3r1]

Dropbox mentions Microsoft, Google and Apple as competition, because for these companies, file synchronization is just another feature (not a product). Steve Jobs said it himself: https://techcrunch.com/2012/01/23/dld-2012-drew-houston-yes-...

And sure, the big three don't seem to care too much about privacy (although Apple has recently been making some strides with regards to encryption).

The fact that there are many "not worth mentioning" competitors building Dropbox alternatives (or add-ons) with E2E encryption may signal that there actually is a demand.

It's only a matter of time before one of these companies gets it "right".