LoLSkin (Is it Bannable or not?)

So, who doesn't know LoLSkin is a program which allows you to use custom skins or official skins which only you can see, and there are a lot of rumors that it is bannable and that it is not bannable, im asking for EUW and EUNE regions at the moment. On their website there is a picture of Riot member saying that you won't get banned for using it because it is only visible to you. Why should you get banned for something that only you can see, it doesn't do anything at all.
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