If one of founders was arrested, it doesn't mean that servers and bitcoins was seized.
If I was a cofounder or an admin with server rights, and saw the founder get dragged off like he was the Silk Road founder, all the while I was thinking we were as legit as GDAX or Poloniex, I'd probably crap my pants, and freeze the entire site.
Not run away with anyone's funds, but I wouldn't continue running it until our site's legal status is clarified.