[dsacco]

That doesn't resemble anything like the business practices of mature exchanges. The best analogy I can think of offhand is a stock split or (more frequently) a dividend. An exchange could not in any universe give its customers 10 days to withdraw its funds or agree to forfeiture.

You don't just get to take customer assets because you sent out an email and gave them 10 days. This is why we have the concept of consideration in the first place.

[scott00]

There are actually some somewhat analogous situations in the US listed equity options markets. Options are typically adjusted for corporate actions other than regular dividends. However, special dividends are only adjusted for if they are more than 12.5 cents per share. And for voluntary corporate actions the options are adjusted according to whatever would happen to a non-electing shareholder. So if there's an exchange or tender offer, or a merger with electable form of payment, you have to exercise your options ahead of the ex date in order to benefit.

[dsacco]

I think that's a really good point, but I'm still going to contest it.

Options are derivatives, so they're different from cryptocurrencies, which are themselves analogous to equities. An option inherently has a date of expiration, whereas a cryptocurrency (even a fork) does not intrinsically have such a thing, and with an option you do not own the underlying unless you choose to exercise.