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You should know in BitShares there are smart coins (fiat-pegged value-stable tokens), although the supply could be insufficient for the ICO, but, using the smart coins won't hurt the price of BitShares. ETH price is far from stable especially when they have to dump a lot.

Thank you for advice

The reason for not using Bitshares is lack of liquidity. There is a huge supply of capital in Ethereum tokens that wants to diversify. So block.one is doing the distro on the platform where the money is.