They have anti venom for the two deadly ones, the Redback and Funnel Web.
Hundreds get bitten each year by Redbacks but it has been a couple of decades since somebody died.
You have quite a long time to get to the hospital and get the anti venom.
Not as many get bitten by the Funnel Web but you have far less time to get treatment.
Don't let the fauna scare you off. There is always something dangerous lurking nearby but they are not out to get you.
Any encounters and bites are by accidental confrontations.
Except for the Crocodiles and Sharks, they are out to get you

Black Holes happen when God divides by zero.