I would not say that Lichess can't do anything about it, not categorically. But I agree it is very hard to implement some sort of measure that would not be overly complicated, or would really make sure not to punish players who were, for whatever technical or other reasons in life forced to let the clock run down, and did not do this intentionally (just leaving a losing game without resigning.) I do wish it were possible, because it REALLY happens a lot.
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