If a mallicious user were to receive a virus by an automatically created and signed account, s/he clicks the link, would the virus be blocked from propagating into the other three copies of the user’s account, or would a malicious virus corrupt the entire user account?
This is of course assuming a few things: 1. A virus can be created and uploaded into a MaidSAFE account. 2. The virus is written in such a way as to corrupt at least one user account and spread by way of the native messaging app. 3. The user is inexperienced enough to trust a new user (without rank or reputation), or a suspicious hyperlink in a message from a known connection.