Similar situation in hospitality. Alot of people don't want the full time work and be forced to work. Plenty of staff with side gigs or other responsibilities.
Been there seen them, almost all then get to a point they want a loan for a house or car and then suddenly want full time employment and no-one offers it and they complain bitterly about how unfair it is. They are also very short sighted in that they don't realise for the 25% (much less if part time) extra pay they have opted out of super and holidays.
When Coles offered to take aviation employees on they also dropped the hours on many others working for the company significantly, which being a major casual employer they can do without reason.