Is there actually anything pointing to Ubuntu One client portion having a
component that is non-free? I don't think this has ever been clearly answered
here.
I haven't seen anything to suggest it has any non-free dependencies that was
reliable info. I haven't looked at the code though either.
That said I think we should be careful not to confuse free software with
other issues. Canonical is under no obligation to release the code running on
the back end. Almost nobody releases such code either. Even had/or if
Canonical is using GPL licensed code there is no obligation to release
modifications of it publicly. That would only be true if Canonical released a
binary of it. However since the company is only (as far as I know) running
the software on there own servers I'm not sure this is a free software issue.
The only thing here that seems to make me think that there is a free software
issue is the suggestion of missing components from the Trisquel repository.
Maybe this is due to one of the other issues. I don't know.
There are lots of other issues. "cloud computing" is potentially dangerous.
You are placing your data needlessly into the hands of companies that neither
care about you, your data, or your privacy. Or if they care about you or your
data it is only where it suits them (making money from selling it or
statistics to advertisers, etc).