Rush Shiv?

So I've not really played at all this season, but I've come back during the preseason for the big climb in season 8. I'm an ADC main and I've seen toonnsss of people rushing Shiv first time. Before even getting any AD. I dunno, this seems really bad to me but so many people are doing it that i feel like i must be missing something. Whats up with that?
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