Is pwnwin really supported by Riot?

pwnwin | eSports Tournament Platform For Cash
The best place to play eSports for cash prizes. Free tournaments, challenges & contests available. Make your first deposit and we will double your cash!
I heard in PhyLoL`s Video that this site is supported by Riot games and that it is safe. Can I trust it or No? If I a Rioter is reading this- can you tell me if I will be in trouble if I use it and is it really supported from Riot?
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