You might be surprised. I have some crypto friends in the CIS countries and though they are smart enough to steer clear of WEX, they say that many in the Russian and eastern European communities are still generally comfortable using them. WEX quickly became the highest volume CIS-facing exchange again. Then there is Exmo and not much else besides small, local exchanges.
I have indeed noticed that there is a hard core group of mainly Russian users that follow this exchange everywhere, which as you pointed out might be due to there not being any serious alternatives.
Exmo has been speculated to be affiliated with wex, but there is no solid proof to be found other than the obvious similarities. Looks like that market is definitely in need of some healthy competition to allow users to spread.