Handy Emergency Backup Mode
Not the same as the "gig economy" - that's considered different again and is actually subject to many different court cases right now. Gig economy in Australia refers to UberEats/Deliveroo/etc riders/drivers, people doing jobs on Airtasker, through Gumtree, etc.
Temporary workforce might be closer. Casual rates are higher per hour, which is supposed to make up for sick leave but doesn't really. In return they don't get sick or annual leave and don't have a contracted number of hours. This is also subject to court battles right now, and in fact a few weeks ago a court ruled that casuals who worked a consistent number of hours each week should be entitled to leave as they are being used like permanent part-timers/full-timers without the security.
Because a lot of casual work is on the minimum wage, it means that a lot of them don't have savings, or much in the way of financial security, putting them in an impossible situation. And one of the huge casual sectors? Aged care workers. Who often work for big companies that outsource to aged care homes, and might not work at the same home two days in a row. Big, big problem. But casual is also dominant in the retail sector, as well. It's gotten progressively worse over the last decade.