Ubuntu One team follows the tag and answers when possible. From their support:

Chances are if you have a problem someone from our global community can help you. Ask Ubuntu is the place where Ubuntu One users can ask and answer general questions. However, if you have account or payment-specific questions you will need to contact us directly.

Ubuntu One is watched after by a few of the Ubuntu One devs. Questions revolving around sensitive information or account specific details are off-topic for the site. All other questions that fall under the current On-Topic umbrella are on-topic

Ubuntu One team follows the tag and answers when possible. From their help page:

Did you know?

#FAQs Our frequently asked questions are here to help you quickly find an answer to your question. So please have a quick look here first. If you can’t find what you are looking for here, have a look at our tutorials, jump on to our Ask Ubuntu forum or contact us directly.

#Community We have an enthusiastic community. Chances are if you have a problem someone from our global community can help you. Ask Ubuntu is the place where Ubuntu One users can ask and answer general questions. However, if you have account or payment-specific questions you will need to contact us directly.

#Contact us If you can’t find an answer on our FAQs or Ask Ubuntu, then please fill in our contact form and someone from the team will get in touch with you.

Emphasis my own

Ubuntu One is watched after by a few of the Ubuntu One devs. Questions revolving around sensitive information or account specific details are off-topic for the site. All other questions that fall under the current On-Topic umbrella are on-topic