Why is Riot so greedy compared Blizzard and Valve?

Out of the three MOBAS, it has the least generous system. Can Riot just not afford it like Valve and Blizzard since they only have one game?
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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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