Not only that, the sport leagues themselves do not want for that information to become public, so even if they knew there was some match fixing going on, it is likely they will choose to hide it instead of actually investigating what is happening, because if they did so and they found out most teams and players were engaging on it, then they will lose the confidence of the fans and their support, bringing massive losses and it could be a blow from which they may not recover.
Match fixing does not involve the league management as it is something done in high secret. The likely people that are involved in match fixing might be the players, officials, and possibly the coach. These are the people that can directly influence the outcome of the match, so they are always or partly on the know of match fixing. It might not be all of the listed people, just few players can arrange match fixing but not correct score which is the peak of match fixing.
If the management of the league find out about match fixing, they will not keep silent about it instead they will activate disciplinary measures to discourage it and also protect the integrity of their league.
Yes you are right, but the people that can fix a match are probably those in higher ground like VAR, is just like the match are on the hands of this guys, they can easily cancel any goals that's scored by those they do not want them to win. However it is bad to fix a game and mostly when they fix the game in a way that the strong team have to lose.
I don't remember ever seeing someone being this honest about the crime they want to commit. We usually see people promising great earning opportunities for easy work and stuff like that, which immediately smells like a scam.
Here is the thing though: If I was a criminal and match fixer who know and can find players willing to participate in match fixing, I wouldn't need you, would I?
I hope you get caught during your first attempt and never get a chance to do it again.
Match-fixing is easy money, and the more people involved, the bigger the risk.
This kind of things likely to happen when big team meets a small team, (and you know) on these kind of match between a big and a small team, gamblers always bet on the big team to win the small team, so when the big team lose or draw the whole gamblers that bet on them also lose.