Facebook game that copied League of Legends champions makes thousands of dollars weekly.

Blatant LoL copies
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Came across a game on facebook that blatantly copied LoL champions and their abilities.Is it legal to copy another games creativity and make lots of money from it? Pretty sure its not allowed otherwise I would go learn to make games, steal ideas and make tons of money too. There are more champions they copied from LoL , Dota 2 and heros of the storm.
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