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Yeah, the community for those games are not yet popular. But once they've become more popular, sportsbooks will have them enlist because there's a large community that supports them. I think that's about the consistency of such communities. Unlike the other popular games, they have it on their books because of their community and those games are very much popular. Maybe someday they'll have it on their list.
I hope that it will happen because I am growing fond of fighting games despite being an avid FPS player my whole life. Maybe someday, Streetfighter or Mortal Kombat will have their big break and get their chance to become a part of eSports betting.
As far as I know, Streetfighter and Mortal Kombat is a game that available for PS and another machine which I do not know the name
But if you want to know more, you can visit this website:
https://www.esportsbets.com/street-fighter/
https://esportbetting.eu/games/streetfighter
https://www.gamopo.com/esports/street-fighter/
On that site, you will see that gg.bet is the site that has the game. So you can try to play on that site.
I do not know much about the site, and I do not have experience playing on that site, so be careful.
Besides gg.bet, you can check on the other gambling site with Streetfighter game, but still, be careful to gamble.