These boxing games are not to be bet in my opinion.
Both sides would have agreed a priori who is going to win the match and they will one target to get money from this event. I think that the same happened with McGregor all these years and let him make a fortune.
I would agree that there are boxing matches that are rigged.
But I doubt that Pacquiao himself will really cooperate on it, if ever he is approached for a match fix. This is not WWE, this is pure boxing, and this is no longer the 50's or 60's where fights are rigged because of the mafia.
Maybe what you are saying is that they hype that McGregor would have a chance to beat Floyd. Yes, they did a good job and make them a lot of money, but fixing it, I doubt it.