I guess the total fire ban is largely in reference to outside fires and things that cause sparks.

Cigarette butts, angle grinders, open fires, BBQs etc.

In national parks and also on private land in backyards etc.

There was a case just a couple years ago where someone was using an angle grinder fixing a lawnmower and the sparks causes his backyard to catch fire which ended up burning down hundreds or hectares and dozens of houses.