In this context when one actor pulls out, the eyes turn on the others who either pull out or will have to accept being seen as supporting the regime. The coordination doesn’t have to exist for it to look coordinated. No one wants to be seen as late to leave.
Plus the longer you stay, the more the value of ruble, and exchange rates drops and stocks/etc of those affiliated w/ the sinking ship that is Russia, the more likely you are to be holding the 'hot potato' and lose the most money when everything drops....in other words better to get going while the going is good.
It also takes time to interpret how the sanctions affect an industry and what actions need to be taken, and those interpretations are going to be pretty correlated.
I remember reading an analysis of (I believe) WWI that said that by that point, the rulers of Europe had successfully completed the hard work of discouraging war among themselves through a long-term project of intermarriage. They were all related to each other and therefore mostly uninterested in going to war against each other.[1]
But at some point popular demand for war started to rise and the noble houses weren't able to stop it.
We're seeing something similar here.
[1] This can't be the whole story; European history is replete with brother-brother and father-son wars. But I think the idea is worth considering anyway.
