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The BTC-BCH split was a fork. If you had bitcoin before, you now had bitcoin on both chains. Blocktrades mentions this will be an airdrop, such that all existing STEEM holders will end up with two tokens (except for Sun).

A swap is distinct in that it requires users to trade or destroy an old token for a new token. That's an interesting model to make sure the new token holders actually care about the project. But ultimately you'd lose the automatic adoption you get from an airdrop

It'll be like bcash but it wasn't a swap it was coins on both chain, you'll have sell on one side as fast as possible to buy more of the other side.

I don't see why exchanges wouldn't support it, Most likely none at start.

Yes they do, maybe they don't lists scamcoins with pre-mines for free through.