yes
Yes there are Platypuses in some Australian zoos and animal sanctuaries, but there are strict regulations on these places keeping platypuses.
No, there are definitely no platypuses in Canada, either in the wild or in zoos. Platypuses are only found in the eastern half of the Australian continent, including Tasmania.
No. The Australian Aborigines may have hunted platypuses when they pursued their traditional lifestyle, but no-one else eats platypuses.
No. There are no secret agents among platypuses, nor among any other type of native Australian animal.
The platypus is on the Australian "two bob" twenty cent piece.
A platypus is an Australian mammal that lays eggs.
No. Platypuses do not currently qualify as threatened, nor Near Threatened, nor prior to 2001 as Conservation Dependent. The Australian Government lists the platypus as "common but vulnerable".
No, none outside of Australia. There are very strict and complicated legal issues surrounding ownership and export of platypuses. Even Australian zoos themselves have a hard time getting permission to keep them. They are best at surviving in the unique Australian ecosystem.
You don't. Platypuses are a protected species and may not be hunted or killed.
Platypuses and echidnas are both monotremes, that is, egg-laying mammals.
As platypuses may not be kept as pets, the question is irrelevant. Platypuses feed on tiny invertebrates such as annelid worms, crustaceans and insect larvae. The only places qualified to keep platypuses are some Australian zoos and animal sanctuaries. These places must follow strict regulations for keeping platypuses in captivity.
No. Platypuses are wild animals; they do not have to have any commercial use. In the Kate 1800s and early 1900s, platypuses were hunted for their fur, as they have beautiful velvety pelts. However, this practice was banned when platypus numbers dropped to critical levels, and platypuses, like all native Australian mammals, are now protected by law.