All three owned by the same registrant, which is an organization meant to hide whois data. Not bad in and of itself, but fishy in this situation.
Two of the three accounts created within a day of each other. All three sites registered within a six week time span. Once again, there's thousands of sites registered every day, but it strikes me as odd given these circumstances.
Finally, the earliest post on Voat from each:
submitted 16 days ago by shiwankaswe to Automobile
submitted 17 days ago by shiwankaswe to news
submitted 16 days ago by hustonlarry to funny
Mumbleberry's stalkers are in the comments of the handful that I flipped through, and @Mumbleberry has already reported this to /v/reportspammers, but I wanted to make it more visible. Mumbleberry's stalkers spammed up /v/reportspammers, so what the actual fuck is going on there?
These domains need a sitewide ban, as do the user accounts, and also the accounts that stalk Mumbleberry as it seems clear that they're for CCP farming.