Actually, I had the same curiosity whether boxers or fighters are allowed to bet on their own fights. I found out that they are entirely allowed and it is legal to bet on themselves, what's not legal is if they will bet against themselves which is quite confusing why would they do that. Also, if they will decide to gamble, they are only allowed to bet the whole outcome and not specifically like by a way of KO or UD. Seems reasonable enough to put these guidelines because they are the only ones who are controlling the fight.
Back to the fight, few days more. For those risky gamblers who wanted juicy profits, this is your chance to bet on Akaho, although his chances are not that great.
True! Boxers are allowed to bet for themselves but they are only allowed to make a straight bet for themselves meaning they are not allowed to bet whether they can KO or TKO the opponent and the time when they can beat the opponent[1].
Furthermore here are some list of Boxers that bet for themselves
Shane Mosley
Ahead of his fight against Canelo Alvarez in 2012, Shane Mosley placed a $1 million wager on himself to win despite only earning $600K for the fight. It was quite the gamble, and as we know, it didnt pay off. Mosley lost by unanimous decision.
Keith Thurman
More recently, welterweight contender Keith Thurman bet on a first- or second-round knockout of retired legend Manny Pacquiao before their 2019 bout. He fell on the wrong side of a split decision. Two years earlier, he bet on himself to knock out Danny Garcia in the first round. He failed to do so, ultimately winning by split decision.
Mikey Garcia
In early August, fellow welterweight Mikey Garcia told reporters that he would bet $2 million on himself to win if he ever got the opportunity to fight Pacquiao. He has long sought this contest. Unfortunately for him, Pacquiao announced his retirement from boxing on September 29 following a unanimous decision loss at the hands of Yordenis Ugas eight days earlier.
Some fighters enjoy better luck with their bets.
Tyson Fury
Prior to his massive title fight against Wladimir Klitschko, current WBC heavyweight champion Tyson Fury made a £200,000 bet on himself to win. He claimed a unanimous decision victory. In doing so, he not only took home the WBA, WBO, and IBF belts as well as the title of lineal champion, but he also doubled his earnings on the night. That is quite the haul.
Mayweather
While he denies it, Mayweather is rumored to have bet on himself a number of times too. Considering his name recognition and sparkling 50-0-0 record, those wagers would have raked in a ton of dough.
So it is very possible for Akaho to bet for himself because it is allowed by the sports book, what is not allowed is picking the method or time of victory[1].
Permitting such wagers would amount to permitting fight manipulation and harm the reputation of both boxing and legal sports betting.
[1]
https://shortboxing.com/why-boxers-can-bet-on-themselves-but-not-against-themselves/#:~:text=Fighters%20can%20only%20place%20straight,boxing%20and%20legal%20sports%20betting.