Marking their own homeworkVAR is run by ref's making decisions on their fellow ref's competence (and with the knowledge that, in the near future, those roles will be reversed). It also guarantees them more money/employment, as pre-VAR there was a ref and 2 linesmen, now there's the ref, 2 linesmen and 3 'off duty' refs manning the VAR. It's in their own self interest to keep VAR going and to 'have each other's backs' as much as is possible. Self regulation never works!