The thing about legislation is: The new government can make/change/remove it. Unless you enshrine it in the Constitution - and we have a pretty poor track record of changing that.
I would think that if something were established with legislation capping how much can be spent, it would (a) be very difficult to get past the Senate crossbench and (b) be very expensive in terms of political capital, if you didn’t take it to an election as a core issue.
The thing about legislation is: The new government can make/change/remove it. Unless you enshrine it in the Constitution - and we have a pretty poor track record of changing that.
I would think that if something were established with legislation capping how much can be spent, it would (a) be very difficult to get past the Senate crossbench and (b) be very expensive in terms of political capital, if you didn’t take it to an election as a core issue.