It will be very difficult to fight the "cartels" involved in match fixing. Unfortunately, this is not just a Brazilian problem, it is a global problem from Asia to Europe to South America it is rampant. There may even be international rings involved in this. For example despite gambling being illegal in India, there are still reported cases of match fixing that occurs in cricket. A great solution to this is that sports budget should be increased so that players in smaller leagues would get better renumeration.
I agree every country has its own gambling lords and organized mafias to control gambling betting through game fixing, these mafias have contacts and money to lure top players and even officials to connive and fix the matches, this betting fraud in Brazil game fixing has their version in many countries, they are not yet exposed but it really is happening, many sports commissions are aware of game fixing but the mafias have control on some media for it not to leak.
Every country has its own watchdog but sometimes the watchdogs are on the payroll of these mafias.
These are the kinds of problems that the government must deal with. This is outside the scope of any normal person to overcome as these cartels are definitely powerful and dangerous. Since they control majority of these platforms, they can manipulate the outcome to their liking, thereby making gambling a business venture on their end.
Unfortunately for us normal individuals, we really cannot do anything about it but to avoid engaging into their controlled casino. The more a person fights or attempts to show restraint, the more risk you put on your own life with it.