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I think the losing and winning ratio stays more or less the same over time but what changes is the points that you get for wins or that you lose for defeats. Let's say you win, you get 10 points. You lose, they take 20 points. Like that the algorithm can prevent you from getting up in the leagues.

I have not really noticed that, but you are surely correct because I have been dumped into Novice and then boom jumped back up to almost making it to Bronze 2 before being dumped down again lol