You know, such control over referees and the ring is surprising.
Some athletes seem overly confident, as if they believe everything is under their control. Of course, I agree with you that we can't say for sure if there is a conspiracy, but the situation remains unclear.
What kind of athlete would be without self-confidence? Well, he certainly wouldn't be at the top if he didn't believe in himself and his abilities... And it's normal for top players to impose their own rhythm, in individual and group sports. Either you impose your own rhythm and game, a way to dominate the field/ring... or you are cornered and somehow try to defend yourself from all attacks.
Referees can make questionable decisions, and it happens in all sports, even in the most prestigious competitions. Such a decision is always good for one team and bad for the other... the team and the fans of the team who do not like the decision immediately start with conspiracy theories, but the referees see things from their point of view and it certainly happens that they do not see everything. Nowadays with all the cameras around, it's hard to fix a game I think, and I don't think that gambling companies are doing these things... why would they? They wish to earn even more money... I don't see that as a good reason, they are making a profit no matter who wins/loses, in the long run, they are real winners, and I can't imagine some big companies risking that for a one-time making-money-scheme.