Recently there have been a few hackers in the game. I'm only one person, and I can't manage banning every hacker. Here's how you can prevent hackers from playing in your matches:
To ban a player as the host, press TAB to open the scoreboard. Then press down the scroll wheel on your mouse to unlock the cursor. Click on the player you want to ban, and choose "Ban." This will ban them from the match and prevent them from rejoining. If there's a hacker in your match, please ask the host to ban them.