thằng mod trên wj nó nói vậy đó!Just an update for everyone: Uploadstation is not a scam.
They provided proof showing the users that got their accounts disabled did indeed referred themselves, he provided proof showing the same IP, last login IP and similarity in password for both accounts that got disabled.
P.S. For users who can not see referral's username, it's because Uploadstation removes them since they're fraud.