How about Keybase? It has a pretty seamless files experience, I find. Open source, end-to-end encryption, Windows client, painless sync, free for 250GB...
Continuity? I mean, does Keybase have a business model yet? Or is it still "$bigshot_vc who is friends with the CEO believes a few crypto/security gambles are in order"?
Not meant critically, I love that they exist and found funding. It's just, as long as the model is "once the privacy shit hits the fan in some widely published scandal, we'll be the one that's ahead" there's only two outcomes: 1. It doesn't happen soon enough and Keybase runs out of runway, or 2. It happens, one of the many Keybase products becomes wildly popular because of it, and Keybase will ditch the others because "yada yada focus core business".
My understanding is they are focused on user growth and improving the UX right now. Also, I believe they could be sustainable without being as widely popular as dropbox. IIRC eventually they will have a paid tier for their kbfs solution. I know I would certainly pay. For me Keybase is a one stop shop: identity management, individual and team chat, encrypted git repos, and secure file sharing all on a cross-platform system. No one really offers the service they do.
Well, according to this, they can't read your data.
"These folders are encrypted using only your device-specific keys and mine.
The Keybase servers do not have private keys that can read this data. Nor can they inject any public keys into this process, to trick you into encrypting for extra parties. Your and my key additions and removals are signed by us into a public merkle tree, which in turn is hashed into the Bitcoin block chain to prevent a forking attack. Here's a screenshot of my 7 device keys and 9 public identities, and how they're all related."
