Well I suppose if your Arbing, that’s fair enough for the TAB to limit.
I once had Betfair account but closed it couple years ago, several times i deposited and they took money out twice, took ages to sort, inplay is always suspect and pools only good for metro Aus racing, NZ punters never supported Betfair on NZ racing so pools crap.
With so many sophisticated programmes punters are using around the world, and gambling sites limiting those arbing, must be hard to make money off racing, no doubt easier making money inplay on sports.