i have encountered like 15 of them even the "Unknown"
i dont do Devil Rumble very often. Is this a thing in lower rank?
those acts are leveled up with Crystal's and gold and 5 star units, only to be sold on Ebay or other sites for real money as many new players want to feel powerful starting new so they pay 25-50 bucks per acct, seen many acct being sold like this
Abandoned Reroll account