Quite simply because unlike any other nation the Australian government gave people a choice of vaccine. If you attend a vaccination center you will see maybe 10 line up for AZ and the other 1000 lining up for Pfizer or now Moderna. Most Australian produced AZ has ended up overseas in Fiji etc... Definitely no conspiracy there, the court of public opinion delivered that outcome.
I like how Anti-vaxxers say vaxxers spread fear and then have statements like this:
the plandemic and the global experiment continues…..
Remember it’s only a mask…
its only for two weeks …
It only to flatten the curve …