This way people can check the store even when they don't have access to the system they have val on(if they have a pc and go somewhere out) or maybe a section in the riot mobile app as it's a bit feature lacking honestly. This could be done for both val and lol and would lead to more purchases as players have a better chance of buying the skin they have been waiting for as there's lesser chance to miss a day of checking it.

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I know there's 3rd party sites for this but obviously there's a big security risk with that.