Griefing is an act aimed at harassing others with unsportsmanlike behavior. In War Robots, it usually manifests as intentionally blocking one’s way, pushing a robot towards the opposite direction / towards damage zones, constantly following a Commander for no reason. Not only this kind of action does not contribute to a team's victory, it ruins game experience for other players.
What consequence may follow?
A Commander may receive a warning, and in case their behavior doesn’t change, their game profile will be temporarily suspended.
How do I report such a player?
Use the in-game reporting tool: when a battle is over and you’re viewing the after-battle scoreboard, tap on a Commander’s nickname, then tap ‘Report’ and select the appropriate option.
NOTE: Currently, there’s a single place where the ‘Report’ option can be accessed: the after-battle stats screen. Unfortunately, if you run out of robots and leave the battle before it is actually over, it won’t be possible to report a player.