Nobody is denying the existence of hackers on official or community servers. We are very aware of it, but hacking is obviously not only a problem in our game, it's a global problem. And of course hackers can connect to any community server that is not password or whitelist-protected. And not every community server has active admins, and following up on cheating accusations can take time.
That said, we are aware of the situation, and hacking reports should be forwarded to our anti-cheat provider BattlEye.