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The best part here... if he somehow managed to win in court with Riot, the money he would be getting back from Riot still wouldn't fully cover the "lawyer" he hired for the case. So all in all, he'd be spending more money in the end. Not gaining any.
That's a big "if" by the way. Game companies have a fine tuned Terms of Service Agreement now a days to prevent these such things. It is true that when you spend money on these games all you are doing is gaining access to other parts of game company property to use.
You pay money to get into a Carnival.
You cause a ruckus and get kicked out.
You want your money back.
You are not getting your money back.
Conclusion: The money you spent was to gain temporary access to something you do not own. Not to literally buy it and own it.