Yes, definitely there should be certain rules against the players from making bets tho, it's likely possible they can do it without being caught, who gets involved and was caught is who they considers a victim of law breaking. In every sports I believe their is every means deployed by this experts to make the game look not rigged whereas an under ground work is being carried out. We as gamblers may not be opportuned to detect all this, we just stake or bet under probability and waits the outcome.
There are rules that are imposed already but it's just that there are only players who sometimes don't abide them because they think these rules sucks and they think they can gain more advantage if the play outside it. Maybe there are some who are lucky and skilled enough to not get caught but we can only wish they will get busted next time so that the competition will get fairer. Verified legit betting platforms are not rigged but sometimes we bettors are only paranoid to think they are like that, especially if we experience to lose a lot.
Whoever is found guilty should be severely punished, for misleading gamblers who staked their wins on him, with some months ban and a fine.
Indeed that those who are guilty of committing a violation should be punished accordingly so that other's won't follow it anymore or their rates will only get lowered if stopping them completely is not possible.