People quitting games in PTCGL when losing

I don't know if I'm posting this in the right section…anyway, I've been playing on PTCGL for a little more than a year and a half, and I need to ask the community one question. At the start I thought it was a connectivity issue, since we don't have super fast internet in my area, then I started having a suspicion and now I'm basically certain: most of the times I'm ahead in games, people quit the game instead of conceding. I say this because it never happened once when I was the one losing and I'm basically wondering why and how…it feels rude and it makes me waste minutes playing against nobody just to not lose a win, which I can use to climb the ladder. I've seen it happen to a couple streamers as well and I really wonder why people do this. Do they just disconnect? I don't get it.
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I just played a game against a Chien-Pao player who took multiple turns without doing anything, which seems strange to me since the app usually cuts the game short if a player is inactive too long. Still, I don't understand what's the advantage over conceding… do they close the app and it doesn't register as a loss to them?
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