If someone bet Jake Paul vs Mike Tyson and believe the match will going to serious, they're made mistake. You can't really know which one will win because it's an exhibition match, so I won't be surprised if Jake Paul will win.
So I happened to watch a UFC related movie yesterday and the main character is a very strong one who never loses a fight but during a fight he decided to lose the fight, I found out that he did it intentionally because his uncle and his uncle's friend bet a lot on the biggest odd, which is the other fighter.
I believe this is illegal in professional match, the player must not intentionally lose the fight and his relatives must not bet on his match. That's why most casinos ask KYC to prevent from this kind to happen.
It is still very possible for a relative to place a bet on his relative even if KYC is involved, all they need to do is ask a friend to pass the KYC and the friend will also be the one to place the bet, the person's name and surname will be different, enough to confuse the platform that they are not related in any way.
You also called the Mike Tyson and Jake Paul fight an exhibition, that sounds like something that can definitely be rigged, it's left for them to choose, win for themselves and their statue, or win or lose for more money.