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That user was instantly blacklisted as soon as we found out.

sir check the wallet of that user one time. You can see that there are lots money withdrawn from different smart steam users. i am scared too. Because i am also smart steam user. this person can attack my account.

No. He can't.

1.) Todays change results in you being able to withdraw only to your own account.
2.) Whoever manages the account who received all the funds - had to have multiple private keys from other accounts.
3.) You're safe.