Welp, this was old news, but I somehow missed it... or I forgot that I knew it. Either is possible.
Spark axed in Australia
In May of 2018, just 67 Australians bought a Spark, compared to a whopping 484 Kia Picantos (the segment leader). That's why they killed it.
As a result, it appears the Mirage has slightly grown its market share in the city car segment, while the overall segment is still shrinking.
Related thread: Mirage vs Kia Picanto
Funny that it's the opposite situation in Canada. In the last couple of years, the Spark has absolutely dominated the Spark/Mirage/Micra fight.
EG: last month's sales