jann wrote:But I don't think this applies here, as there is no ("legal") option to lose on time when the move was made in time.
What is the definition of a "move" in an Internet go tournament?
(a) For the player to identify a place that s/he would like to play, and click on that spot; or
(b) The selected intersection is received by the server.
Mateusz did not make the move on time, by the definition in (b). So what? It's not in his control, folks say. But many online tournaments don't care - I brought up poker; it can be the same for some online chess tournaments, too. It's not uncommon to adopt the policy of: "you play in this tournament understanding the risks that lag may occur; timeouts may happen. These exceptions to not change the result". This is a perfectly reasonable policy. Lag sucks, but it's a reality of online gaming.
But maybe we don't like that policy. Maybe we'd like to be more forgiving for the (a) scenario, above. Okay, sure. Then let's make a policy for it.
But we have no policy like that, and there is no automatic reason that it has to be that way, if you're trying to argue from a "legal" standpoint.