As of 31st October they are 943,976 registered users but users logged in using it is normally between 100-300 every time i have been logged in, here is a cached page from just before it went down..
https://webcache.googleusercontent.com/search?q=cache:Z_qtJFr9OB0J:https://www.virwox.com/+&cd=1&hl=en&ct=clnk&gl=uk

i have tried several times to login today, first time i got "403 forbidden" second time  i got "an error has occurred please try later" and just now i just get a blank page
yesterday i tried ping request which timed out
its doubt it will be an exit scam, there commission over 24 hours for converting SLL alone is £13,922.89 (@3.9%)  sounds more like a ddos attack, strange how support has not sent all users with an email explaining