Before anyone else says, we're not supposed to talk about it, there are Fight Clubs being organized... Looks like it could be funny for a little while and maybe R* could implement this into the game where you could invite a greifer to fight barehands instead of the Parley mechanic?
https://www.reddit.com/r/reddeadredemption/comments/a4r42z/we_made_a_fight_club_in_red_dead_online/
https://www.reddit.com/r/reddeadredemption/comments/a4r42z/we_made_a_fight_club_in_red_dead_online/