I don't believe there is any corruption with the VAR, that is just too far fetched. There will of course be bias as there is with any human decision. It is not possible to get a computer to make the decision. Computers are dumb and only do what they are told to do. This means that the rules of the game need to be very defined and open to zero interpretation. The rules of football are deliberately set in a way that they can be interpreted. This may seem silly, but it does give the ref the ability to make a judgement call and he/she can decide if there was intent from the player, this level of interpretation can't be made by a computer (yet!).
IMO, The only way to fix the issues with inconsistent referring decisions is to make the process much more open to scrutiny and have penalties for poor referring. Maybe a points system for poor decisions that results in bans from referring games and a financial impact to how much they get paid. Currently, there are no consequences for refs for doing a bad job. It is not that difficult to fix but it will cost money. Refs don't get paid much and if they are subjected to financial penalties they will, somewhat understandably, strike or revolt.
Maybe they need to be paid more money and we could attract better quality and also implement financial penalties for poor performance or alternatively implement financial bonuses for good performances with very few errors in a game