And anything guatanteeing significant and very fast returns on your investment is potentially fraud. Like turn a $1000 into $6000 potentially scam and you will just not be able to withdraw money from fraudulent website.
Bitcoin confeferences must be organized and properly regulated. Security and safety provided
If business conference held or a trade show- do you allow counterfeiters to come in and say have a booth at convention and purchase from other vendors with counterfeit cash - ofcourse not....that's not allowed