Board Thread:Support Requests - Getting Technical/@comment-5558012-20160515144804/@comment-5288784-20160516191909

https://en.wiktionary.org/wiki/confidential – Kept, or meant to be kept, secret within a certain circle of persons; not intended to be known publicly.

I don't know what definition Wikia uses, but sharing an account with hand-selected people doesn't need to violate the confidentiality rule. It does pose some security problems and introduces group responsibility, but if two people trust each other infinitely, then technically sharing an account should not be prohibited.