Vatya
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If the opponent is being cheap and immediately passes their turn without giving you a chance to react, there's a trick you can use! But honestly, watching a stream like that is just beyond the pale. I don't think banning the person is necessary, as they're not a malicious rule-breaker, but they should definitely be warned! (yellow card + disqualification from the tournament). And in general, we're seeing more and more dishonorable behavior, and it would be good to include these in the rules. Besides the two mentioned above, another example is writing in the general game chat during someone else's turn! Add these to the list.
And I'm saying that in the 10 seconds of the stream I saw, I only saw what I would see in a tavern. If I wanted to watch the whole thing, I would have prepared or asked someone. And why should I be punished? My actions violate moral norms, yes, but not legal norms. Until this is all written into law, it's all just "dishonorable behavior."