Can you name me some martial artists that gives an open challenge to anyone to promote

their art? Is there any famous martial artists out there that gives an open challenge for anyone to fight them?

I read in wikipedia that the Gracie's family teacher Maeda does that to promote Jujitsu. I just would like to know as someone who practices that must have tune their art to handle real-life (at least in the ring) rather that practicing within their art.
 
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