> It's a lie if it's false when you say it - not if it becomes false in the unpredictable future

Isn't this exactly what's happening if you accept an exploding offer and then later rescind your acceptance if you get a better one? The job offer was the best you had at the time, so you accepted it. Somewhat unexpectedly you later receive a better offer, so you have to rescind the first.

I'm not necessarily saying I agree with this practice, but I do agree it's pretty close to what Coinbase is doing with the roles reversed.