That's not quite true. Roo has been hacked multiple times, which is why he took down his server for an extended period of time a few years ago.This game has been around for 10(?) years, and not once has there been any incident of hacking.
There are plenty of untrusted servers (or at least there were...I wouldn't know these days). The only truly secure server back in the day that wasn't a Shockwave server was Dash. Dash did datacenter for a living, and his servers were well secured.
Anyway, I don't want to throw fuel on the paranoia fire, but AC definitely has valid points. Make sure your firewall, IPS and anti-virus software is up to date.
Happy Holidays to all the tank nerds still left here! Hope you are all well!