Due to the pandemic that we currently have now I think one of the sports should be included in a sports betting site is eSports I'm familiar with the games Dota 2, CSGO, LOL, etc. but fortnite is something new I don't actually watch tournaments of a battle royal but I think this will be pretty interesting to see the team on where you place your bet to survive from other players.
Dota2 and CSGO are already in different betting platform so I guess fornite betting wants to have a unique and originality in their betting platform so they come up to the original plan on having the kinds of sports they had for betting. And we should not underestimate the sports they chose for betting because they had too vast fans and gamblers willing to bet in their platform. Pretty sure they can get huge on it as it seems that for now they had no competition with the sports they chose for betting.
Agree with you about respecting the game, fortnite has a lot of fans around the world and I think it can still do well in betting whether the graphics is good or not, or even thought its hard to bet about the winner cause it ain't like CS GO or Dota 2. I believe that it still has its audience. However, if we are talking about olympics here, I may see fornite as a good game but I still don't see it as game for the olympics, just an opinion.