My avatar represents a modern angel of death. An agent of both God and the Devil he is tasked with killing off sinners displeasing God and sending them straight into the waiting arms of Satan and the fiery depths of Hell. Before killing his victims, I imagine they would all repent and confess their sins to him, so his sewn up mouth represents the seal of confessional.
I get why he is saying report anyone you have suspicions on, but I'm pretty sure that message has created a witch hunt. I for one was messaged last night and interrogated by a user asking who my original account was, do I have skype, where I was from, how old I was and did I know a user that was banned a few years ago (I think they were implying I was him.)
I'm not sure if this person's intention was to report me, they may have done so already in a private message, but it made me think that is dangerous at the moment to just report everyone you have suspicions on without solid proof. Yes some accounts are obvious, but there has to be some 'benefit of the doubt' given.
To my friends on here it's obvious I'm not a multi, but to strangers I may look like I am as I only played a few games and of the games I have played I have done well. So if I get reported what process would happen...? Would I get banned on a hunch? I mean...I thought Admin didn't have the ability to check IP addresses yet.
I think at the moment you should be reporting only people you're sure are multis and if you do have a hunch, say that you're not sure to Admin and you would like them to investigate.
About a year ago I had an appendicitis.
https://tengaged.com/blog/SmoothStalker12/8696244/if-you-suspect-multi-accounts 
Come to my graduation ceremony pls... :p