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I don't know where you've seen this, but we don't see this at all.
One of the hardest data points you see, in ranked, is that more time = more skill for players. In most cases, if you were to map time invested:skill you would see a linear line for the community. The problem is the entire community is all getting better at the same time. So to rank up you not only need to get better, but you need to get better faster then the people at your rank.
I don't have hard data to argue more cheaters, trolls, new players, etc. But I will say more players are more likely to play the start of a new act/episode because of new content coming out. So if anything I would say you are more likely to run into those cases at the beginning of an Act/Episode then the end.
If you do have data to support this I'd love to see it tho!