If you are from North Hemisphere, please see World Map "upside down" and using Hobo Dyer Equal Area Projection. Australia is big, but mostly a big desert (no food, no water)
If you want to replicate a big success in Brazil, it will be as hard as the same to replicate it in all European countries, but in this case with 1/8 of population and the majority of the persons DO NOT own or WILL NOT use a credit/debit card to buy online! They will prefer to research online and then buy offline.
The same for Africa, and perhaps the same for Russia.
(See eHarmony Brazil how it failed)
Many if not most, USA, Canada or European businesses models are inviable in Latin American countries!
Perhaps the same situation for Africa, Russia or even Australia.
(transportation costs could be 10 times bigger than Europe)
Rocket Internet clone empire, most complicated financial puzzle in the World?
AB Kinnevik & Rocket Internet GmbH. capital markets day 2014 / 13 presentations