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 doubt if the VAR could risk their job to that extent only to get match fixed, for them to be employed to do a professional service, they are expected to to condole any form of corrupt practice and if found, they are going to risk loosing their job, which i believe the consequence aftermath will be more higher than what they tend to be rewarded for fixing a match, maybe other people are doing such anyways aside the VAR.
For sure they won't and this is big shame on their name then provably they would lose a career for this situation. But we can't deny that there are some people working behind and make this thing to happen but if OP just offer a small amount of money then provably what he want provably won't happen.
But maybe people should forget about doing this things since right now they cannot execute those match fixing schemes since everyone is aware of it and also for sure there are many ways to catch this actions then penalize those people doing this things. Also for people looking forwards for such match fixing things much better for them to erase a thoughts that someone could do it for them since most likely they will just end up getting scam since usually what people we can see offering such services are mostly scammers.
To be realistic here, things like this happens, people are doing it and some are not and cant accept such nasty offer, sometimes we may just have to weigh the available options to each other, is it about what we stand to get within a short time and lose the reputation we have built over years in our profession or deny their offer and do justice, corruption is the root of all these and if those in charge are not greedy and corrupt, things like this cant happen or take place in this civilized era of gambling.