Hmm...the FAQ does not say and a quick search did not turn up an official company statement. Even if there were an official privacy statement, as a practical matter, my rule of thumb is that anything that you divulge to another party becomes less reliably private.

As just one example, no company can 100% guarantee that it won't have a rogue employee, even if their overall intention is to respect privacy.

So, as with anything privacy related it's all about understanding, mitigating and finding your degree of comfort with certain risks.