Or is it likelier that the exit scam is chosen at a time when there's more money than usual on market wallets? Correlating factors here could be vendor and customers account creation rates, among others.
Another alternative is that various external factors culminate in the necessity of exit scamming at a seemingly random time to us (but not so random to those running the market). I don't see any way to satisfactorily make any correlations in this situation.
It doesn't have nothing to do with it but saying there's a direct casual relationship is farfetched.