In my opinion, you can never be sure whether someone shares your values and
sticks to this values when offering a "Service as a software substitute" and
I can't imagine anyone being able to prove the honesty of a provider.
What you're asking for is a company who claims to share your values.
I don't know any of them, perhaps someone does.
But trusting them doesn't seem to make sense to me.
Concerning dropbox:
the nautilus implementation is free software but your right because the
daemon is proprietary. So no one should use it.
