Not like the guy intentionally lags sometimes. With the new introduction of Skill Based Matchmaking the system puts you with players from who knows where. The game stopped pairing you with local players vs people on your same level. Also your suggestion with auto restricting after so and so report could be abused that's why Bungie looks through all logs before handing down judgment.
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I can understand that. It would be infuriating to be restricted/banned because a whole team reports the player for reasons aside from cheating.