Don't buy or otherwise acquire (e.g. as collateral) Bitcointalk account(s). Don't sell or otherwise let others use your Bitcointalk account(s).

If you acquire an account you can be held responsible for any actions of the previous owner(s), and if you let others use an account you can be held responsible for their actions as well, including scams and bannable offenses. You're likely to get red trust for the purchase/sale as it is considered a deceptive practice similar to fake documents IRL.

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TBH I'm not really sure if you can list every possible offense. How about loan requests without proper collateral, newbie PayPal trades, etc.

And even if you can - are the people who do these things going to read this and comply?