I think match fixing really existed on if not all maybe some sports worldwide including combat sports. Match fixing is really annoying on our part as a gambler as it could turn against our bets right on the spot. But that will of course decrease teams reputation and other involved parties.
Even I saw that in my own country's league some who were involved in match-fixing were punished for being caught, this is certainly the case in some countries as well because many mafias are involved and they also bet big money just so they can arrange matches, while for small bettors like us we don't know anything and only see the news after a long time coming back to be exposed so obviously this is annoying.
Maybe now the match-fixing is tighter where the mafia is only a little involved or even no longer exists for other big European leagues, but I can't deny that it still exists in the minor leagues because they can arrange it.