Sporza is government owned goddamn their geobloque.
Sky and ITV aren't though
Actually I can't think of any European broadcaster that has no geoblock on their streams unless they are carrying the international rights on behalf of the race organiser.
There are two reasons for geo-restrictions.
1) No legal right to broadcast in that country.
2) No economic sense in broadcasting outside host country.
Obviously there are no international rights holders for the Australian nationals, so it comes down to whether or not you want to give away free bandwith to users who are of no benefit when it comes to selling ad space.
Yeh it's bad but its up to race organisers to do it properly a la RCS (who used their own bandwith) before Acquarone destroyed them.