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US adds web and gaming giant Tencent to list of Chinese military companies
(www.theregister.com)
This is a most excellent place for technology news and articles.
You're probably thinking the "full release" but the game was being played by the public for several years, and was quite popular for over year prior to the "official release". So, no. They didn't. Their investment came a full year after I'd already been playing the game.
The game was made already. They bought an existing product.
I can’t find anything suggesting the game was released prior to 2008
Riot released some video at sometime talking about how they had to cram to make the game even playable prior to the sales pitch so I really doubt it was made before that