Are custom skins bannable ?

I've never used custom skins , but there are so good ones on the Internet and i wanted to give it a try. But i wanted to ask someone from Riot (or anyone who is 100% sure ), are custom skins bannable ???

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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