Riot banning because of chat

Why does Riot think they need to take it into their own hands to ban players for chatting? Why can't they just give a permanent chat restriction? I have spent over $500 on this game, and because a player got butt hurt because I didn't gank their lane, I got banned from it...This game is pathetic, and no wonder this game is dead in NA. They literally run off their player base trying to control everything.
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