I would agree with you that it's a good reason if there were evidence of the coercion. I don't think we can assume it outright.
what does any of that mean?
* She and a few other people were in relationships with SBF and/or each other at the time. A polycule is generally a connected graph of n > 2 people (the nodes) in romantic/sexual relationships (the edges).
* The kimchi arbitrage was a trade where you bought BTC for USD somewhere other than Korea, transferred them from the non-Korean exchange to a private wallet, then sold those BTC for Won in Korea, and then sold those Won for USD (and repeat the cycle). It worked because Korea had strict capital controls for its citizens that meant that the price of bitcoins on native exchanges was substantially higher than outside. It also carried tremendous risk because you had to wait for those bitcoins to settle in your private wallet at each cycle, effectively exposing you to risk associated with fluctuations in the bitcoin price.
Physical movement in and out of South Korea is part of the Kimchi arbitrage, so you have to "run off" to do it.
Is this a real thing, or just a finance joke I just don't understand?
I love a good arbitrage technique, but this one really just reads like an excuse to go to South Korea with your friends (or your polycule).
The risk that you end up getting banned from entering Korea for doing this trade too much was real, but I don't think anyone who tried this trade faced any of the possible consequences.