I tried to log in to their site and was hit with a KYC requirement--and I don't recall ever getting an e-mail with the news about that.  Anyone know the story behind this? 

Not surprised, since I've been thinking that anonymous exchanges are going to become extinct for quite some time now, but Kucoin was one of the last ones with a decent reputation.

And by the way, this is another reason why you don't keep coins on exchanges for long.  It isn't like they're pulling a scam here, but if you want to pull your funds off Kucoin before having to verify your identity, looks like you'd be out of luck and your coins would be stuck there.  Fortunately I just had some dust there.