Why is shadow tag banned in OU but not in LC?

Question

It's seems weird to me.

Comments

I wrote a huge answer and it got deleted. In short the Shadow Tag users themselves don't have the same affect in LC as OU. In OU Shadow Tag created a big problem with Stall as after certain things were checked Stall became impossible to deal with as a result of Shadow Tag. In LC, Gothita is a fast and frail revenge killer and Wynaut isn't bulky enough with it's super subpar stats. They aren't cut for gamebreaking  stall and thus don't have the same effect.

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PX just use that as the goddamn answer T^T

Answer 1

In simple words:

Shadow Tag was banned in OU (as well in some other tiers) due to it being too strong; as it can trap opponents. It also doesn't bring a similar effect as with other tiers. Some abilities such as Stall creates a huge problem with it as it becomes difficult to attack as the battle progresses.

LC allows it mainly because it brings a different perspective and how Pokemon are not as strong as compared to other Tiers.

Hope I helped! :)