Can someone explain what scripting is?

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The A.I. lacks the creative thinking of a human brain , so its hardly better to let it play on its own you can use it to avoid skills or to land one but it cant predict human behavior like a actual human would .

Some champs' playstyle benefits greatly from botting for one reason or the other.

The most infamous example would be Cass bots and to some extent, Vayne bots and others. As their playstyle aren't that diverse and malleable to begin with (except some special scenarios), hence some might just think "why practice more to get better when I can just load up a program and effectively master this particular champ?"

The only way to catch if someone is botting is by observing their pattern, if they are too repetitive in their tactics/actions or their toon jerks way too fast (and frequent) beyond humanly possible level then it's a bot. Other than that, I don't think there are that many ways to distinguish a program from a player as this game isn't all that creative 90% of the time anyway which creates this botting problem in the first place.

Creativity doesn't matter against scripts. That's like saying, "Well there's a robot that is immune to all known weaponry, can penetrate all known armour, and is literally incapable of missing a shot. But combat is about creativity."