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Many exchanges list coins prior to release and allow trading but not withdrawal (as you rightly said, they don’t really exist). I ask as the article doesn’t seem to suggest that 2 coins will exist after the fork.

How can it be done?
How can a nonexistent thing be traded?
For a swap to happen there should be a buyer and a seller.
If it does not exist, how can it be sold?
What happens in such a case if the ICO/HF is postponed or cancelled after people already bought it?

I don’t the precise mechanics but it has happened regularly. It also happened before bitcoin cash forked from btc. Some exchanges were offering the ability to trade it (or more accurately, a representation of it similar to a future). Possibly the exchange knew it had X btc on deposit, so would receive X bitcoin cash? I don’t know exactly how they manage risk.

Futures or options could have been sold, but remember that this is an upgrade, not an overly contentious fork.

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