Is Minion Pinning a Punishable Offense?

There's a video going around of a mechanic where you can pin a minion to your tower at level 1 to make the wave crash into your turret sooner. Someone told me that it's cheating and I might get banned for it. Is that the case, or is it okay to do? EDIT: For those wondering, I sent in a support ticket and they said there's nothing wrong with this.
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