Competitive tournaments should have:
1. Luck minimised in every way possible. Random seeding, or preferably by ranking if there is a valid ranking system.
2. An incentive to win in every round of a tournament. A lot of tournaments end up having problems with tactical throwing due to poor management in a lot of ways, or teams can just stop playing since they either lost or won at a certain point.
3. No collusion between players. These sorts of tactics result in unfair and predetermined games. Shouldn't have to explain why this is a bad thing.
I don't see how you can have these done in battle royale games. Put 100 people vs each other and then you either let top 50 go through, meaning people can just stop playing the game after a certain point. Or you are left with 1 person out of 100, meaning that there would be a massive luck factor left in who goes through from the 100 players.
I just don't see how these tournaments can even work. To me it seems more like a circus, you go and watch cool stuff be done, or you participate in it because you like doing the cool stuff. Nothing is wrong with that, it just isn't competitive.