fairly simple. whoever has a problem with technology that reduces mistakes and bent decisions to a big minimum, has problems.
How does it reduce mistakes ? The VAR official can basically say what he wants, as we found out to our cost in Schalke, or when he decided it wasn't fair to give a penalty against a 'little' team (Burton) Or when he is the only person in the world that thought the Rags needed ergh sorry should get a penalty in the 93rd minute in Paris.
It should be a brilliant system and worked well in the world cup but that shows how it can be and is being manipulated in the Chumps league. The standard between the 2 competitions is stark.